"Good fathers": Community perceptions of idealized fatherhood and reported fathering behaviors in Mwanza, Tanzania.

Globally, perceptions of idealized fatherhood have been expanding beyond men's breadwinning roles to also value men's engagement in nurturing care. While fathers' caregiving behaviors are increasing, most childcare activities are still largely performed by mothers. In this study, we unpacked community members' beliefs about the meaning of "good fathers" and explored the degree to which these values aligned with the main caregiving behaviors reported about fathers with young children under age 2 years in Mwanza, Tanzania. Qualitative data were collected as part of a broader formative research study for which we conducted in-depth interviews with 29 fathers, 23 mothers, 4 village leaders and 4 community health workers as well as 3 focus group discussions with fathers, 2 with mothers, and 6 with both fathers and mothers combined. For this secondary data analysis, we used a grounded theory approach combined with thematic content analysis to investigate the nature of fatherhood. We discovered four key ideals associated with "good fathers": fathers as providers, nurturers, supportive partners, and authoritarians. The primary ideal of fathers as breadwinners was strongly aligned with the main reported practice of fathers trying hard to financially providing for their families. However, paternal behaviors reflecting ideals of fathers as nurturers and supportive partners were less practiced. Although ideals towards good fathers as authoritarian were least explicitly valued, many fathers were reported as engaging in controlling behaviors and using violence. The links between fatherhood ideals and behaviors was influenced by various factors, including poverty, men's limited time availability at home, and restrictive gender norms. Overall, our results reveal some alignment but also inconsistencies between the ideal version of fatherhood and commonly reported paternal practices. These discrepancies highlight the need for further investigation into the underlying factors that both enable and constrain the links between fatherhood ideals and behaviors. Our study results have important implications for the design of interventions that seek to enhance fatherhood to improve the development and wellbeing of children and families.

Microbial etiology of vertebral osteomyelitis/discitis amid the opioid epidemic.

OBJECTIVE: The primary goal of this study was to establish the current microbial trends in vertebral osteomyelitis/discitis (VOD) amid the opioid epidemic and to determine if intravenous drug use (IVDU) predisposes one to a unique microbial profile of infection. METHODS: The authors performed a retrospective cohort study consisting of 1175 adult patients diagnosed with VOD between 2011 and 2022 at a single quaternary center. Data were acquired through retrospective chart review, with pertinent demographic and clinical information collected. RESULTS: Staphylococcus aureus was the most cultured organism in both the IVDU and non-IVDU groups at 56.1% and 40.7%, respectively. In the IVDU cohort, Serratia marcescens was the next most prevalently cultured organism at 13.9%. CONCLUSIONS: The present study demonstrates that in the IVDU population S. marcescens is an organism of high concern. The potential for Serratia spp. infection should be accounted for when selecting empirical antimicrobial therapy in VOD patients.

A qualitative study of maternal and paternal parenting knowledge and practices in rural Mozambique.

BACKGROUND: Providing nurturing care for young children is essential for promoting early child development (ECD). However, there is limited knowledge about how mothers and fathers across diverse contexts in sub-Saharan Africa care for their children and from whom they receive guidance and support in their caregiving roles. We aimed to examine caregivers' nurturing care practices and sources of parenting knowledge in rural Mozambique. METHODS: This is a secondary analysis using data from a qualitative evaluation of a pilot intervention to improve nurturing care for early child health and development within existing health systems. The evaluation was conducted across three primary care health facilities and their catchment areas in Nampula province, Mozambique. For this study, we analyzed data from in-depth interviews conducted with 36 caregivers (32 mothers and 4 fathers) to investigate mothers' and fathers' daily caregiving experiences. Data were analyzed using thematic content analysis. RESULTS: Caregivers described various caregiving roles relating to general caregiving of young children (e.g., feeding, bathing, caring for child's health) and stimulation (e.g., play and communication) activities. Mothers more commonly engaged in general caregiving activities than fathers, whereas both mothers and fathers engaged in stimulation activities. Other family members, including siblings, grandparents, and aunts/uncles, were also actively engaged in general caregiving activities. With respect to sources of parenting knowledge, caregivers received parenting guidance and support primarily from their own mothers/parents and facility-based health providers. CONCLUSIONS: These findings highlight the importance of adopting a holistic approach involving caregivers and their context and reveal potential strategies to promote caregiving and ECD in rural Mozambique and similar contexts.

Clinical characteristics and outcomes after trigeminal schwannoma resection: a multi-institutional experience.

Given their rarity, the clinical course of patients undergoing trigeminal schwannoma (TS) resection remains understudied. The objective of this study is to describe clinical characteristics and outcomes in patients undergoing surgical resection for TS in a multi-institutional cohort. This is a retrospective study of patients undergoing TS resection at two institutions between 2004 and 2022. Patient, radiographic, and clinical characteristics were reviewed and analyzed with standard statistical methods. Thirty patients were included. The median patient age was 43 (IQR: 35-52) years, and 14 (47%) patients were female. Median clinical and radiographic follow-ups were 43 (IQR: 20-81) and 47 (IQR: 27-97) months respectively. The most common presenting symptoms were trigeminal hypesthesia (57%) and headaches (30%), diplopia (30%), and ataxia/cerebellar signs (30%). The median maximum tumor diameter was 3.3 (IQR: 2.5-5.4) cm. Most tumors were Samii type C (50%) and mixed cystic-solid (63%). Surgical approaches included endoscopic endonasal (33%), supratentorial (30%), combined/staged (20%), infratentorial (10%), and anterior petrosal (7%) approaches. Gross-total resection was achieved in 16 (53%) patients. Radiographic tumor recurrence was noted in four patients at a median of 79 (range 5-152) months. Twenty-six (87%) patients reported improvements in at least one symptom by last follow-up. The most common perioperative complication was new cranial nerve deficit, with 17% of patients having a transient deficit and 10% having a permanent cranial nerve deficit. Surgical resection of TS showed good progression-free survival and symptom improvement, but was associated with cranial nerve deficits.

Father involvement is a protective factor for maternal mental health in Western Kenya.

Depression is a major global health concern especially among mothers of young children in low- and middle-income countries (LMICs). While various risk and protective factors have been well-established, the role of fathers in potentially mitigating maternal depression remains understudied. This study aimed to investigate the association between father involvement and maternal depressive symptoms in rural Western Kenya. We used cross-sectional baseline data collected in February-March 2023 from a cluster-randomized controlled trial evaluating the effectiveness of a community-based parenting program for improving early childhood development. Primary caregivers with children 0-18 months of age were enrolled into the trial across 51 villages in Nyamira and Vihiga counties. We analyzed data from 413 mothers who were in a relationship with a male partner (i.e., father of the young child). Maternal depressive symptoms were measured using the CESD-10. Father involvement was reported using a multidimensional measure of men's engagement in childcare activities, household chores, early learning activities, and affection towards their child. We used multilevel regression models to estimate the adjusted associations between father involvement (overall score and by specific domains) and maternal depressive symptoms. We also conducted exploratory subgroup analyses to assess whether this association differed by child age. Overall, greater father involvement was associated with fewer maternal depressive symptoms. Specifically, fathers' engagement in household chores and childcare activities had the strongest protective associations. Exploratory subgroup analyses revealed larger associations for mothers with younger children under 6 months. Our findings suggest that father involvement is a protective factor for maternal mental health. Engaging fathers in early childhood interventions and encouraging men's involvement in caregiving activities may potentially benefit maternal well-being.

"If my wife earns more than me, she will force me to do what she wants": Women's economic empowerment and family caregiving dynamics in Tanzania.

Women's economic empowerment is recognized as a fundamental component of gender equality and global development. Despite a significant body of evidence highlighting the positive effects of women's labor force participation in low- and middle-income countries, relatively few studies have explored how caregivers of young children perceive women's economic empowerment in relation to childcare and family responsibilities. The objective of this study was to examine how mothers and fathers viewed the links between maternal employment and family caregiving dynamics specifically in terms of couples' relationships and parenting. We conducted in-depth interviews with 23 mothers and 29 fathers of young children under aged 2 years and 9 focus group discussions with mothers and fathers across 4 communities in Mwanza, Tanzania. Data were analyzed through both deductive and inductive approaches. Results revealed distinct gender differences in maternal versus paternal perceptions regarding women's engagement in income-generating activities. Mothers held favorable views towards employment and largely perceived positive effects on parenting, child, and family outcomes. On the other hand, most fathers were unsupportive of women's employment and held restrictive gender attitudes. Men feared a loss of power and perceived various negative consequences in terms of increased marital conflict, poorer maternal parenting, and worse child outcomes. Overall, this study revealed differences in maternal versus paternal perceptions about women's economic empowerment and its links with couples' relationships and parenting that were strongly shaped by gender attitudes. Women's economic empowerment programs that engage men to transform gender norms while incorporating program components to strengthen couples' relationships and promote positive parenting have potential for achieving family-wide benefits among mothers, fathers, and young children.

Violence Against Children, Self-Harm, and Suicidal Behaviors: A Pooled and Country-Specific Analysis of Eight Low- and Middle-Income Countries.

PURPOSE: This study assessed associations between experiences of physical or sexual violence in childhood and self-harm, suicidal ideation, and suicide attempts among young people in low- and middle-income countries (LMICs) and whether these associations varied by sex and perpetrator identity. METHODS: We used nationally representative data from the Violence Against Children and Youth Surveys in eight LMICs (2017-2019). The analytic sample included 33,381 young men and women (ages 13-24 years). Multivariable logistic regressions with country-fixed effects were used to estimate the associations between childhood physical and sexual violence and the three outcomes. Stratified analyses were performed by country, participant's sex, and type of perpetrator (parent/caregiver, other adults, peers, and intimate partner). RESULTS: About 40% of the participants reported physical childhood violence, and 10% experienced childhood sexual violence. Childhood violence was associated with increased odds of self-harm (physical violence: adjusted odds ratio [aOR]: 2.2, 95% confidence interval [CI]: 2.0-2.4; sexual violence: aOR: 2.7, 95%, CI: 2.3-3.0), suicidal ideation (physical: aOR: 3.0, 95% CI: 2.7-3.3; sexual: aOR: 4.0, 95%, CI: 3.6-4.5), and suicide attempts (physical: aOR: 3.6, 95% CI: 3.2-4.1; sexual: aOR: 4.9, 95%, CI: 4.3-5.7). Consistent findings were observed in country-specific analyses. The odds of all outcomes were highest among those who experienced childhood physical violence by intimate partners and childhood sexual violence by parents or caregivers. Young women who experienced childhood sexual violence had higher odds for all outcomes than young men. DISCUSSION: Violence prevention and mental health programs for young people in LMICs should consider the types of violence experienced, the perpetrator, and the sex of the survivor.

Contribution of Food from Market Purchases and Home Production to Child Nutrient Intake: Evidence from the EFFECTS Study Baseline Data.

BACKGROUND: Child undernutrition is prevalent in Tanzania, and households rely primarily on local markets and home production as food sources. However, little is known about the contribution of food market purchases to nutrient intakes among children consuming complementary foods. OBJECTIVES: To quantify the relationships between diversity of foods purchased and produced by households and adequate child nutrient intake in Mara, Tanzania. METHODS: Cross-sectional baseline dietary and household food source data from the Engaging Fathers for Effective Child Nutrition and Development in Tanzania study were collected from mothers of 586 children aged 9-23 mo clustered in 80 villages in Mara, Tanzania. We conducted mixed effects linear regressions to quantify the association between the diversity of foods consumed at home, from market purchases and home production, and nutrient intake adequacy (based on 24-h food recalls). RESULTS: Children had inadequate diets, with fewer than half of children consuming adequate amounts of vitamin A, vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B9 (folate), calcium, iron, and zinc. Breastfeeding was associated with higher overall mean adequacy (b = 0.15-0.19 across models, P < 0.001). Diversity of foods purchased was positively associated with the intake of vitamin B12 and calcium (both P < 0.001); this effect was attenuated among breastfed children. Among nonbreastfed children, production diversity was positively associated with vitamin A intake (b=0.04; P < .05) but not with intake of other nutrients. CONCLUSIONS: Both household food purchase and food production diversities were positively associated with children's nutrient intake in rural Mara, Tanzania. Nutrition programming should consider the role of food markets in addition to home food production to improve child diets. This trial was registered at clinicaltrials.gov as NCT03759821, https://clinicaltrials.gov/study/NCT03759821.

Management of recurrent giant hemangiopericytoma: illustrative cases.

BACKGROUND: Hemangiopericytoma (HPC) is a rare malignancy accounting for 0.4% of intracranial tumors. HPCs are characterized by local aggressiveness, high rates of recurrence, and a tendency to metastasize to extracranial sites. These features make management of HPCs challenging, often requiring a combination of radical resection and radiation. Given their rarity, optimal treatment algorithms remain undefined. OBSERVATIONS: The authors report a series of four patients who underwent resection of intracranial HPC. Mean age at presentation was 49.3 years. Three patients had reoperation for progression of residual tumor, and one patient was surgically retreated for recurrence. One patient received adjuvant radiotherapy following initial resection, and three patients received adjuvant radiotherapy following resection of recurrent or residual disease. There was one death in the series. Average progression-free survival and overall survival following the index procedure were 32.8 and 82 months, respectively. Progression occurred locally in all patients, with metastatic recurrence in one patient. LESSONS: The current gold-standard treatment for intracranial HPC consists of gross-total resection followed by radiation therapy. This approach allows satisfactory local control; however, given the tendency for these tumors to recur either locally or distally within or outside of the central nervous system, there is a need for salvage therapies to improve long-term outcomes for patients.

Women's empowerment and child anthropometric failures across 28 sub-Saharan African countries: A cross-level interaction by Gender Inequality Index.

Background: Child undernutrition remains a major global health issue, particularly in sub-Saharan Africa (SSA). Given the important role mothers play in early childhood health and development, we examined how individual-level women's empowerment and country-level Gender Inequality Index (GII) are jointly related with child undernutrition in SSA. Methods: We pooled recent Demographic and Health Surveys from 28 SSA countries. For 137,699 children <5 years old, undernutrition was defined using anthropometric failures (stunting, underweight, wasting). Women's empowerment was assessed using three domains of Survey-based Women's EmPowERment (SWPER) index: attitude to violence, social independence, and decision-making; and country-level gender inequality was measured using GII from United Nations Development Programme. Three-level logistic regression was conducted to examine the joint associations of SWPER and GII as well as their interactions with child anthropometric failures, after adjusting for sociodemographic covariates. Results: Overall, 32.85% of children were stunted, 17.63% were underweight, and 6.68% had wasting. Children of mothers with low-level of empowerment for all domains of SWPER had higher odds of stunting (attitude to violence: OR=1.15; 95% CI, 1.11-1.19; social independence: OR=1.21; 95% CI, 1.17-1.25; decision-making: OR=1.16; 95% CI, 1.12-1.20), and consistent results were found for underweight and wasting. Independent of women's empowerment, country-level GII increased the probability of underweight (ranging ORs=1.46; 95% CI, 1.15-1.85 to 1.50; 95% CI, 1.18-1.90) and wasting (ranging ORs=1.56; 95% CI, 1.24-1.97 to 1.61; 95% CI, 1.27-2.03). Significant interaction was found between women's empowerment and country-level GII for stunting and underweight (p<0.05). Conclusions: In SSA countries with greater gender inequality, improving women's social independence and decision-making power in particular can reduce their children's risk of anthropometric failures. Policies and interventions targeted at strengthening women's empowerment should consider the degree of gender inequality in each country.

Fathers' mental health and coping strategies: a qualitative study in Mwanza, Tanzania.

OBJECTIVES: To investigate the nature of paternal mental health problems, their causes and the coping strategies used by fathers of young children under the age of 2 years. DESIGN AND SETTING: We conducted in-depth interviews with fathers, mothers, community leaders and community health workers as well as focus group discussions with fathers-only, mothers-only and mixed groups of fathers and mothers. Respondents provided their perspectives on the psychosocial challenges affecting fathers and how fathers responded to their mental health problems. Data were triangulated across stakeholders and analysed using thematic content analysis. SETTING: The study was conducted in four communities in Mwanza, Tanzania. PARTICIPANTS: The total sample included 56 fathers, 56 mothers and 8 community stakeholders that were equally distributed across the four communities. RESULTS: Respondents highlighted a spectrum of mental health concerns affecting fathers, including elevated parenting stress, depressive symptoms, and anxiety. Causes of paternal mental health problems included poverty, child-related concerns, marital problems and family illness. When asked about paternal coping strategies, both fathers and mothers shared that fathers mostly turned to negative coping strategies to manage their distress, such as paternal alcohol use and poor conflict resolution strategies. However, respondents also shared how some fathers used positive coping strategies, such as seeking out social support from their family and friends, engaging in exercise and leisure activities and relying on their faith. CONCLUSIONS: Overall, this study highlights the importance of supporting positive mental health among fathers. Our findings can inform the design of psychosocial programme components that can be integrated within parenting interventions to promote the well-being of specifically fathers and ultimately improve the family caregiving environment.

CT guided biopsy for osteodiscitis reduces cost of hospitalization in the landscape of increasing intravenous drug use: A single center retrospective analysis.

OBJECTIVE: Osteodiscitis has been demonstrated to show significant morbidity and mortality. Cultures and CT guided biopsy (CTB) are commonly used diagnosis of osteodiscitis. This study's purpose is to evaluate the cost burden of CTB and to evaluate how IVDU affects patient management in the setting of osteodiscitis. METHODS: Patients admitted for osteodiscitis from 2011-2021 were retrospectively reviewed and stratified into cohorts by CTB status. Additional cohorts were stratified by Intravenous Drug Use (IVDU). Patient demographics, total cost of hospitalization, length of hospitalization, time to biopsy, IVDU status, and other factors were recorded. T-Test, Chi-squared analysis, and ANOVA were used for statistical analysis. RESULTS: Total cost of hospitalization was recorded for 140 patients without CTB and 346 patients with CTB. Average cost of hospitalization for non-CTB was $227,317.86 compared to CTB at $119,799.20 (p < 0.001). Length of stay (LOS) was found to be 18.01 days for non-CTB and 14.07 days for CTB patients (0.00282). When stratified by days until biopsy, patients who had CTB sooner, had significantly reduced cost of hospitalization (p = 0.0003). Patients with IVDU history were significantly younger (p < 0.001) with lower BMI (p < 0.001) and a significantly different clinical profile. There was a significant difference in positive open biopsy when separated by IVDU status (p = 0.025). CONCLUSION: CTB was associated with significantly reduced cost of hospitalization and LOS compared to non-CTB. IVDU patients with osteodiscitis have significantly different clinical profiles than non-IVDU that may impact diagnosis and treatment. Further work is indicated to elucidate causes of these differences to provide high value care to patients with osteodiscitis.

A meta-analytic review of the implementation characteristics in parenting interventions to promote early child development.

This review summarizes the implementation characteristics of parenting interventions to promote early child development (ECD) outcomes from birth to 3 years. We included 134 articles representing 123 parenting trials (PROSPERO record CRD42022285998). Studies were conducted across high-income (62%) and low-and-middle-income (38%) countries. The most frequently used interventions were Reach Up and Learn, Nurse Family Partnership, and Head Start. Half of the interventions were delivered as home visits. The other half used mixed settings and modalities (27%), clinic visits (12%), and community-based group sessions (11%). Due to the lack of data, we were only able to test the moderating role of a few implementation characteristics in intervention impacts on parenting and cognitive outcomes (by country income level) in the meta-analysis. None of the implementation characteristics moderated intervention impacts on cognitive or parenting outcomes in low- and middle-income or high-income countries. There is a significant need in the field of parenting interventions for ECD to consistently collect and report data on key implementation characteristics. These data are needed to advance our understanding of how parenting interventions are implemented and how implementation factors impact outcomes to help inform the scale-up of effective interventions to improve child development.

Maternal Decision-Making Power and Care-Seeking Behaviors for Acutely Ill Children: A Multilevel Analysis of 33 Sub-Saharan African Countries.

Timely and appropriate healthcare seeking is crucial to reduce child mortality. However, rates of care seeking for acute childhood diseases remain low in sub-Saharan Africa (SSA). This study investigated the association between maternal decision-making power and care-seeking behaviors for children with diarrhea and acute respiratory infection (ARI) in SSA. Demographic and Health Surveys from 33 SSA countries were used in a sample of mother-child pairs (mothers aged 15-49 years; children aged 0-59 months) with a recent child episode of diarrhea (N = 41,729) and ARI (N = 71,966). Maternal decision-making power was defined as making decisions on all four familial topics alone or jointly with the husband/partner. Care-seeking behaviors were measured as seeking care from health providers, other types of providers, and any providers (including both). Multivariable three-level logistic regressions were conducted. Approximately 60% of the sample sought care from any provider (46-48% from health providers versus 13-14% from others). Approximately 28% of mothers had high decision-making power. After adjusting for sociodemographic characteristics, high maternal decision-making power was associated with higher likelihood of seeking care from a health provider for both diarrhea (adjusted odds ratio [aOR] = 1.06, 95% CI = 1.01-1.12) and ARI (aOR = 1.07, 95% CI = 1.03-1.11) and lower likelihood of seeking care from others (aOR = 0.89, 95% CI = 0.82-0.97 for diarrhea; aOR = 0.88, 95% CI = 0.82-0.94 for ARI). Maternal decision-making power was positively associated with their care-seeking behaviors from health providers for acutely ill children in SSA. Women's empowerment interventions that particularly increase women's agency in decision-making may holistically improve health and well-being of the next generation.

Intraoperative ultrasound-assisted endoscopic endonasal transclival marsupialization of an ectopic retrosellar Rathke's cleft cyst: A rare case illustration and systematic review of the literature.

Not every Rathke's cleft cyst (RCC) is confined within the sella between the posterior and anterior lobes of the pituitary gland. Intracranial ectopic RCCs are extremely rare, with only seven cases reported in the literature. In this study, the authors presented a rare case of a symptomatic ectopic retrosellar RCC posterior to the pituitary gland, causing extensive clival erosion. The surgical nuances of the wide marsupialization of the cyst through intraoperative ultrasound-assisted endoscopic endonasal transclival approach are described, and a systematic literature review of intracranial ectopic RCCs is conducted.

Effects of engaging fathers and bundling parenting and nutrition interventions on early child development and maternal and paternal parenting in Mara, Tanzania: a factorial cluster-randomized controlled trial.

BACKGROUND: Multicomponent interventions are needed to address the various co-occurring risks that compromise early child nutrition and development. We compared the independent and combined effects of engaging fathers and bundling parenting components into a nutrition intervention on early child development (ECD) and parenting outcomes. METHODS: We conducted a 2×2 factorial cluster-randomized controlled trial across 80 villages in Mara Region, Tanzania, also known as EFFECTS (Engaging Fathers for Effective Child Nutrition and Development in Tanzania; ClinicalTrials.gov, NCT03759821). Households with children under 18 months of age residing with their mother and father were enrolled. Villages were randomly assigned to one of five groups: a nutrition intervention for mothers, a nutrition intervention for couples, a bundled nutrition and parenting intervention for mothers, a bundled intervention for couples, and a standard-of-care control. Interventions were delivered by trained community health workers through peer groups and home visits over 12 months. Mothers, fathers, and children were assessed at baseline, midline, and endline or postintervention. We used a difference-in-difference approach with intention-to-treat analysis to estimate intervention effects on ECD (Bayley Scales of Infant and Toddler Development, third edition) and maternal and paternal parenting and psychosocial well-being. RESULTS: Between October 29, 2018, and May 24, 2019, 960 households were enrolled (n = 192 per arm). Compared to nutrition interventions, bundled interventions improved children's cognitive (ß = .18 [95% CI: 0.01, 0.36]) and receptive language development (ß = .23 [0.04, 0.41]). There were no differences between interventions for other ECD domains. Compared to nutrition interventions, bundled interventions achieved additional benefits on maternal stimulation (ß = .21 [0.04, 0.38]) and availability of home learning materials (ß = .25 [0.07-0.43]) and reduced paternal parenting distress (ß = -.34 [-0.55, -0.12]). Compared to interventions with mothers only, interventions that engaged fathers improved paternal stimulation (ß = .45 [0.27, 0.63]). CONCLUSIONS: Jointly bundling parenting components into nutrition interventions while also engaging both mothers and fathers is most effective for improving maternal and paternal parenting and ECD outcomes.

Surgical Characteristics of Intracranial Biopsy Using a Frameless Stereotactic Robotic Platform: A Single-Center Experience.

BACKGROUND AND OBJECTIVES: Cranial robotics are a burgeoning field of neurosurgery. To date, all cranial robotic systems described have been computerized, arm-based instruments that take up significant space in the operating room. The Medtronic Stealth Autoguide robot has a smaller operating room footprint and offers multiaxial, frame-based surgical targeting. The authors set out to define the surgical characteristics of a novel robotic platform for brain biopsy in a large patient cohort. METHODS: Patients who underwent stereotactic biopsy using the Stealth Autoguide cranial robotic platform from July 2020 to March 2023 were included in this study. Clinical, surgical, and histological data were collected and analyzed. RESULTS: Ninety-six consecutive patients (50 female, 46 male) were included. The mean age at biopsy was 53.7 ± 18.0 years. The mean target depth was 68.2 ± 15.3 mm. The biopsy diagnostic tissue acquisition rate was 100%. The mean time from incision to biopsy tissue acquisition was 15.4 ± 9.9 minutes. Target lesions were located throughout the brain: in the frontal lobe (n = 32, 33.3%), parietal lobe (n = 21, 21.9%), temporal lobe (n = 22, 22.9%), deep brain nuclei/thalamus (n = 13, 13.5%), cerebellum (n = 7, 7.3%), and brainstem (n = 1, 1.0%). Most cases were gliomas (n = 75, 78.2%). Patients were discharged home on postoperative day 0 or 1 in 62.5% of cases. A total of 7 patients developed postoperative complications (7.2%). CONCLUSION: This cranial robotic platform can be used for efficient, safe, and accurate cranial biopsies that allow for reliable diagnosis of intracranial pathology in a minimally invasive setting.

Chromatinization Modulates Topoisomerase II Processivity.

Type IIA topoisomerases are essential DNA processing enzymes that must robustly and reliably relax DNA torsional stress in vivo. While cellular processes constantly create different degrees of torsional stress, how this stress feeds back to control type IIA topoisomerase function remains obscure. Using a suite of single-molecule approaches, we examined the torsional impact on supercoiling relaxation of both naked DNA and chromatin by eukaryotic topoisomerase II (topo II). We observed that topo II was at least ~ 50-fold more processive on plectonemic DNA than previously estimated, capable of relaxing > 6000 turns. We further discovered that topo II could relax supercoiled DNA prior to plectoneme formation, but with a ~100-fold reduction in processivity; strikingly, the relaxation rate in this regime decreased with diminishing torsion in a manner consistent with the capture of transient DNA loops by topo II. Chromatinization preserved the high processivity of the enzyme under high torsional stress. Interestingly, topo II was still highly processive (~ 1000 turns) even under low torsional stress, consistent with the predisposition of chromatin to readily form DNA crossings. This work establishes that chromatin is a major stimulant of topo II function, capable of enhancing function even under low torsional stress.

Chromatinization modulates topoisomerase II processivity.

Type IIA topoisomerases are essential DNA processing enzymes that must robustly and reliably relax DNA torsional stress. While cellular processes constantly create varying torsional stress, how this variation impacts type IIA topoisomerase function remains obscure. Using multiple single-molecule approaches, we examined the torsional dependence of eukaryotic topoisomerase II (topo II) activity on naked DNA and chromatin. We observed that topo II is ~50-fold more processive on buckled DNA than previously estimated. We further discovered that topo II relaxes supercoiled DNA prior to plectoneme formation, but with processivity reduced by ~100-fold. This relaxation decreases with diminishing torsion, consistent with topo II capturing transient DNA loops. Topo II retains high processivity on buckled chromatin (~10,000 turns) and becomes highly processive even on chromatin under low torsional stress (~1000 turns), consistent with chromatin's predisposition to readily form DNA crossings. This work establishes that chromatin is a major stimulant of topo II function.