Regional lymph node evaluation in pediatric conventional melanoma subtype: a single-center 10-year review.

PURPOSE: To assess the prognostic and therapeutic significance of sentinel lymph node biopsy (SLNB) and completion lymph node dissection (CLND) in pediatric conventional melanoma (CM), while evaluating potential predictive factors for outcomes. METHODS: We conducted a retrospective analysis of medical records spanning 2009-2020, focusing on patients aged 18 or younger with localized cutaneous conventional melanoma. RESULTS: Among the 33 patients, SLNB detected metastasis in 57.6% of cases, with 52.6% undergoing CLND. Positive SLN patients had higher relapse risk (HR 5.92; 95% CI 1.27-27.7; P = 0.024) but similar overall survival (HR 3.19; 95% CI 0.31-33.1, P = 0.33). No significant differences in disease-free survival (DFS) and OS were found between patients who underwent CLND and those who did not (HR 1.91; 95% CI 0.49-7.43, P = 0.35, and HR 0.52; 95% CI 0.03-8.32, P = 0.64, respectively). Univariate analysis showed age at diagnosis (P = 0.02) correlated with higher recurrence risk, with a 21% hazard increase per additional year of age. CONCLUSIONS: Positive SLN status and age at diagnosis were associated with worse DFS in CM patients. Our study did not find any prognostic or therapeutic value in CLND for pediatric melanoma. Further multicenter trials are needed to confirm our single-institution experience. LEVEL OF EVIDENCE: Level IV.

Introduction of a Warming Bundle to Reduce Hypothermia in Neonatal Surgical Patients.

INTRODUCTION: Hypothermia in the neonatal surgical population has been linked with significant morbidity and mortality. Our goal was to decrease intra and postoperative hypothermia. INTERVENTION: In November 2021, a radiant warmer and hat were included along with standard warming methods prior to the start of General Surgery procedures to minimize episodes of hypothermia. PRIMARY OUTCOME: Core body temperature was measured pre, intra and post-operatively. METHODS: Data were prospectively collected from electronic medical records from July 2021 to March 2023. A retrospective analysis was performed. Hypothermia was defined as a temperature <36.5C. Control charts were created to analyze the effect of interventions. RESULTS: A total of 277 procedures were identified; 226 abdominal procedures, 31 thoracic, 14 skin/soft tissue and 6 anorectal. The median post-natal age was 36.1 weeks (IQR: 33.2-39.2), with a pre-surgical weight of 2.3 kg (IQR: 1.6-3.0) and operative duration of 181 min (IQR: 125-214). Hat and warmer data were unavailable for 59 procedures, both hat and warmer were used for 51 % procedures, hat alone for 29 %, warmer alone for 10 % and neither for 10 % of procedures. Over time there was a significant increase in hat utilization while warmer usage was unchanged. There was a significant increase in the mean lowest intra-operative temperature and decrease in proportion of hypothermic patients intra-operatively and post-operatively. CONCLUSIONS: The inclusion of a radiant warmer and hat decreased the proportion of hypothermic patients during and after surgery. Further studies are necessary to analyze the impact on surgical outcomes. LEVEL OF EVIDENCE: III.

Comparison of Outcomes Between Surveillance Ultrasound and Completion Lymph Node Dissection in Children and Adolescents With Sentinel Lymph Node-Positive Cutaneous Melanoma.

OBJECTIVE: To determine the impact of nodal basin ultrasound (US) surveillance versus completion lymph node dissection (CLND) in children and adolescents with sentinel lymph node (SLN) positive melanoma. BACKGROUND: Treatment for children and adolescents with melanoma are extrapolated from adult trials. However, there is increasing evidence that important clinical and biological differences exist between pediatric and adult melanoma. METHODS: Patients ≤18 years diagnosed with cutaneous melanoma between 2010 and 2020 from 14 pediatric hospitals were included. Data extracted included demographics, histopathology, nodal basin strategies, surveillance intervals, and survival information. RESULTS: Of 252 patients, 90.1% (n=227) underwent SLN biopsy (SLNB), 50.9% (n=115) had at least 1 positive node. A total of 67 patients underwent CLND with 97.0% (n=65/67) performed after a positive SLNB. In contrast, 46 total patients underwent US observation of nodal basins with 78.3% (n=36/46) of these occurring after positive SLNB. Younger patients were more likely to undergo US surveillance (median age 8.5 y) than CLND (median age 11.3 y; P =0.0103). Overall, 8.9% (n=21/235) experienced disease recurrence: 6 primary, 6 nodal, and 9 distant. There was no difference in recurrence (11.1% vs 18.8%; P =0.28) or death from disease (2.2% vs 9.7%; P =0.36) for those who underwent US versus CLND, respectively. CONCLUSIONS: Children and adolescents with cutaneous melanoma frequently have nodal metastases identified by SLN. Recurrence was more common among patients with thicker primary lesions and positive SLN. No significant differences in oncologic outcomes were observed with US surveillance and CLND following the identification of a positive SLN.

Management and Outcomes of Wilms Tumor With Suprarenal Intravascular Extension: A Pediatric Surgical Oncology Research Collaborative Study.

OBJECTIVE: The purpose of this study was to describe management and outcomes from a contemporary cohort of children with Wilms tumor complicated by inferior vena caval thrombus. BACKGROUND: The largest series of these patients was published almost 2 decades ago. Since then, neoadjuvant chemotherapy has been commonly used to manage these patients, and outcomes have not been reported. METHODS: Retrospective review of 19 North American centers between 2009 and 2019. Patient and disease characteristics, management, and outcomes were investigated and analyzed. RESULTS: Of 124 patients, 81% had favorable histology (FH), and 52% were stage IV. IVC thrombus level was infrahepatic in 53 (43%), intrahepatic in 32 (26%), suprahepatic in 14 (11%), and cardiac in 24 (19%). Neoadjuvant chemotherapy using a 3-drug regimen was administered in 82% and postresection radiation in 90%. Thrombus level regression was 45% overall, with suprahepatic level showing the best response (62%). Cardiopulmonary bypass (CPB) was potentially avoided in 67%. The perioperative complication rate was significantly lower after neoadjuvant chemotherapy [(25%) vs upfront surgery (55%); P =0.005]. CPB was not associated with higher complications [CPB (50%) vs no CPB (27%); P =0.08]. Two-year event-free survival was 93% and overall survival was 96%, higher in FH cases (FH 98% vs unfavorable histology/anaplastic 82%; P =0.73). Neither incomplete resection nor viable thrombus cells affected event-free survival or overall survival. CONCLUSIONS: Multimodal therapy resulted in excellent outcomes, even with advanced-stage disease and cardiac extension. Neoadjuvant chemotherapy decreased the need for CPB to facilitate resection. Complete thrombectomy may not always be necessary.

Duhamel Versus Swenson Pull-Through for Total Colonic Aganglionosis: A Multi-Institutional Study.

BACKGROUND: Total colonic aganglionosis (TCA) is a rare variant of Hirschsprung disease (HD) where the colon and portion of distal ileum lack ganglion cells. Most pediatric use either a straight ileoanal (Swenson or Yancey-Soave) or a short Duhamel pull-through for TCA. There are no large studies comparing these techniques. We aimed to compare short-and medium-term outcomes between these approaches. METHOD: A retrospective review was performed among children with TCA from 2001 to 2019 undergoing a primary Duhamel or Swenson pull-through across three large children's hospitals. Patients undergoing redo and patients with greater than 30 % small bowel aganglionosis were excluded. We gathered data on demographics, operative approach, and outcomes at one, two, and three years. Continuous variables were analyzed with t-tests and categorical variables with Chi square or Fisher's tests. RESULTS: There were 54 patients, with 26 (48 %) undergoing Duhamel and 28 (52 %) undergoing Swenson pull-through. There were no differences in sex, age, medical comorbidities, or operative details, including age at pull-through, laparoscopic vs open, length of involved small bowel, and operative time. Length of stay and post-operative complications were not different. Three years after pull-through, patients undergoing Duhamel had fewer stools per day (1-3 stools 69.6 % vs 14.3 %, p = 0.003) and were less likely to be prescribed fiber supplementation (4.2 % vs 43.8 %, p = 0.003). There were no differences in irrigations, botulinum toxin administration, loperamide, or HD admissions. CONCLUSION: Both Duhamel and straight pull-throughs are safe for treatment of TCA, with acceptable short- and medium-term outcomes. Further studies on patient-reported outcomes are necessary to examine long-term differences. LEVEL OF EVIDENCE: III.

Hirschsprung-associated inflammatory bowel disease: A multicenter study from the APSA Hirschsprung disease interest group.

BACKGROUND/PURPOSE: A small number of Hirschsprung disease (HD) patients develop inflammatory bowel disease (IBD)-like symptoms after pullthrough surgery. The etiology and pathophysiology of Hirschsprung-associated IBD (HD-IBD) remains unknown. This study aims to further characterize HD-IBD, to identify potential risk factors and to evaluate response to treatment in a large group of patients. METHODS: Retrospective study of patients diagnosed with IBD after pullthrough surgery between 2000 and 2021 at 17 institutions. Data regarding clinical presentation and course of HD and IBD were reviewed. Effectiveness of medical therapy for IBD was recorded using a Likert scale. RESULTS: There were 55 patients (78% male). 50% (n = 28) had long segment disease. Hirschsprung-associated enterocolitis (HAEC) was reported in 68% (n = 36). Ten patients (18%) had Trisomy 21. IBD was diagnosed after age 5 in 63% (n = 34). IBD presentation consisted of colonic or small bowel inflammation resembling IBD in 69% (n = 38), unexplained or persistent fistula in 18% (n = 10) and unexplained HAEC >5 years old or unresponsive to standard treatment in 13% (n = 7). Biological agents were the most effective (80%) medications. A third of patients required a surgical procedure for IBD. CONCLUSION: More than half of the patients were diagnosed with HD-IBD after 5 years old. Long segment disease, HAEC after pull through operation and trisomy 21 may represent risk factors for this condition. Investigation for possible IBD should be considered in children with unexplained fistulae, HAEC beyond the age of 5 or unresponsive to standard therapy, and symptoms suggestive of IBD. Biological agents were the most effective medical treatment. LEVEL OF EVIDENCE: Level 4.

Predictors of length of stay for simple gastroschisis: analysis of ACS NSQIP-P database.

PURPOSE: We aimed to assess predictors of length of stay for simple gastroschisis utilizing the NSQIP-Pediatric Database. METHODS: The NSQIP-P Participant Use Data File was queried to identify patients with simple gastroschisis. We defined short length of stay (LOS) as patients discharged home ≤ 30 days from birth. We compared patients with short LOS versus prolonged LOS > 30 days. Predictors and outcomes were evaluated. RESULTS: There were 888 patients with simple gastroschisis identified. Half of patients had LOS ≤ 30 days. Patients with LOS ≤ 30 were younger at repair (median age 1 day vs. 3 days, p = 0.0001), had higher birth weight (median 2.5 kg vs. 2.4 kg, p = 0.0001), and were less premature (37 week vs. 36 weeks, p = 0.0001). However, only gestational age and weight at birth were significant predictors of LOS on multivariate analysis (p = 0.0001). Prolonged LOS patients had more instances of ventilation, oxygen supplementation, sepsis (n = 2/446 or 0.4% vs. n = 9/442 or 2%, p = 0.003), bleeding/transfusion (n = 7/446 or 1.6% vs. n = 43/442 or 9.7%, p = 0.0001), line infections (n = 1/446 or 0.2% vs. n = 12/442, p = 0.001), and reoperations (n = 9/446 or 2% vs. n = 26/442 or 5.9%, p = 0.003). CONCLUSION: Prematurity and birth weight are significant predictors of length of stay in simple gastroschisis patients. Prenatal counseling should continue to be one of the main factors to improve the outcomes for patients with gastroschisis. Type of study Retrospective cohort study. Level of evidence Level IV.

A CT scan-based formula for predicting central venous catheter length in pediatric patients.

PURPOSE: Placement of a central venous catheter (CVC) is the most commonly performed pediatric procedure. This study aims to develop simple formulas to calculate intravascular length of CVCs prior to insertion to minimize reliance on fluoroscopic and radiographic imaging, which may not be uniformly available. METHODS: We performed a single-institution, retrospective review of 115 pediatric patients who received both CVC placement and computed tomography (CT) imaging of the chest within 3 months of the procedure. Using measurements from the CT imaging, formulas calculating the length of the intravascular component of the CVC based on height and insertion laterality were developed and compared to previously published formulas. These formulas were then trialed prospectively to validate reliability and application. RESULTS: Formulas were developed for right-sided and left subclavian insertion. The right-side formula accurately predicted CVC length in 52.6% of patients, compared to 47.4% by the Andropoulos formula. The left subclavian formula accurately estimated 62.5%, compared to 34.5% by the Stroud formula. CONCLUSIONS: The optimal intravascular length of central venous catheters may be determined by simple formulas based on patient height and insertion site. LEVEL OF EVIDENCE: III.

Incidence and management of pleural effusions in patients with Wilms tumor: A Pediatric Surgical Oncology Research Collaborative study.

Wilms tumor (WT) is the most common renal malignancy in children. Children with favorable histology WT achieve survival rates of over 90%. Twelve percent of patients present with metastatic disease, most commonly to the lungs. The presence of a pleural effusion at the time of diagnosis of WT may be noted on staging imaging; however, minimal data exist regarding the significance and prognostic importance of this finding. The objectives of our study are to identify the incidence of pleural effusions in patients with WT, and to determine the potential impact on oncologic outcomes. A multi-institutional retrospective review was performed from January 2009 to December 2019, including children with WT and a pleural effusion on diagnostic imaging treated at Pediatric Surgical Oncology Research Collaborative (PSORC) participating institutions. Of 1259 children with a new WT diagnosis, 94 (7.5%) had a pleural effusion. Patients with a pleural effusion were older than those without (median 4.3 vs 3.5 years; P = .004), and advanced stages were more common (local stage III 85.9% vs 51.9%; P < .0001). Only 14 patients underwent a thoracentesis for fluid evaluation; 3 had cytopathologic evidence of malignant cells. Event-free and overall survival of all children with WT and pleural effusions was 86.2% and 91.5%, respectively. The rate and significance of malignant cells present in pleural fluid is unknown due to low incidence of cytopathologic analysis in our cohort; therefore, the presence of an effusion does not appear to necessitate a change in therapy. Excellent survival can be expected with current stage-specific treatment regimens.

Management of intravascular thrombus in cases of bilateral Wilms tumor or horseshoe kidney.

PURPOSE: To describe the oncologic and surgical management of bilateral Wilms tumor or Wilms tumor arising in a horseshoe kidney with intravenous tumor thrombus to help pediatric surgeons negotiate this rare and difficult anatomic circumstance. METHODS: A single-institution, retrospective medical record review identified 4 cases of bilateral WT and one case of WT arising in a horseshoe kidney with intravenous tumor thrombus between 2009 and 2021. The presentation, imaging, chemotherapy regimen, intraoperative approach, and surgical and oncologic outcomes were reviewed for each of these patients. RESULTS: All patients received a total of 12 weeks of neoadjuvant chemotherapy. In two patients, a staged approach to the bilateral tumors was undertaken with the first side being operated on after six weeks of therapy and the other side undergoing surgery after an additional six weeks of therapy. Of five patients, four underwent nephron-sparing surgery of all tumors and one underwent unilateral radical nephroureterectomy with contralateral nephron-sparing surgery. Tumor thrombectomy was performed in four of five cases; one patient demonstrated a complete response of the intravenous tumor thrombus to neoadjuvant chemotherapy and did not require thrombectomy. Three patients received adjuvant flank radiotherapy. Three patients developed medically managed stage II or III chronic kidney disease and no patient required renal replacement therapy or kidney transplant to date. CONCLUSION: Nephron-sparing surgery is feasible and safe to perform in selected cases of bilateral Wilms tumor with intravascular thrombus by utilizing three-drug neoadjuvant chemotherapy, staged approaches to each kidney when appropriate, and detailed preoperative and/or intraoperative mapping of renal venous anatomy. Successful nephron-sparing surgery with tumor thrombectomy is dependent on a branched renal venous system or the presence of accessory renal veins. LEVEL OF EVIDENCE: Level 4.

Bilateral Diffuse Nodular Pulmonary Ossification Mimicking Metastatic Disease in a Patient with Fibrolamellar Hepatocellular Carcinoma.

Pulmonary ossification (PO) is a rare finding, characterized by mature bone formation in the lung parenchyma. We report a 20-year-old female patient diagnosed with fibrolamellar hepatocellular carcinoma (FL-HCC) and bilateral diffuse nodular PO. The patient presented with a unifocal left liver mass and multiple bilateral pulmonary lesions, which were treated as metastatic disease. The patient received neoadjuvant chemotherapy, followed by left hepatectomy, and bilateral staged thoracotomies for clearance of the pulmonary disease. The histology of the pulmonary nodules demonstrated nodular type PO. We present the history, the course of treatment, imaging, and histologic findings of this rare disease process that could mimic metastatic pulmonary disease.