Imaging of Immune Checkpoint Inhibitor Immunotherapy for Non-Small Cell Lung Cancer.

The normal immune system identifies and eliminates precancerous and cancerous cells. However, tumors can develop immune resistance mechanisms, one of which involves the exploitation of pathways, termed immune checkpoints, that normally suppress T-cell function. The goal of immune checkpoint inhibitor (ICI) immunotherapy is to boost T-cell-mediated immunity to mount a more effective attack on cancer cells. ICIs have changed the treatment landscape of advanced non-small cell lung cancer (NSCLC), and numerous ICIs have now been approved as first-line treatments for NSCLC by the U.S. Food and Drug Administration. ICIs can cause atypical response patterns such as pseudoprogression, whereby the tumor burden initially increases but then decreases. Therefore, response criteria have been developed specifically for patients receiving immunotherapy. Because ICIs activate the immune system, they can lead to inflammatory side effects, termed immune-related adverse events (irAEs). Usually occurring within weeks to months after the start of therapy, irAEs range from asymptomatic abnormal laboratory results to life-threatening conditions such as encephalitis, pneumonitis, myocarditis, hepatitis, and colitis. It is important to be aware of the imaging appearances of the various irAEs to avoid misinterpreting them as metastatic disease, progressive disease, or infection. The basic principles of ICI therapy; indications for ICI therapy in the setting of NSCLC; response assessment and atypical response patterns of ICI therapy, as compared with conventional chemotherapy; and the spectrum of irAEs seen at imaging are reviewed. An invited commentary by Nishino is available online. ©RSNA, 2022.

Assessment of the Effectiveness of the Vaginal Contrast Media in Magnetic Resonance Imaging for Detection of Pelvic Pathologies: A Meta-analysis.

OBJECTIVE: Magnetic resonance imaging (MRI) is an excellent modality for pelvic imaging. The anatomy of uterine cavity and vagina is optimally evaluated when the walls, which may spontaneously be collapsed, are distended. Distension of these cavities during pelvic MRI for evaluation of gynecologic diseases has been conducted with vagina, filled with ultrasound gel or saline solution. In this meta-analysis, we aim to assess the effectiveness of vaginal contrast media in MRI for improving the detection of pelvic pathologies. METHODS: The PubMed, MEDLINE, EMBASE, Web of Science, Google Scholar, Science Citation Index, and Cochrane Library databases were systematically searched through March 2019 for studies of the accuracy of MRI using vaginal contrast media in the diagnosis and staging of pelvic pathologies. Four eligible studies of a total of 120 patients were included in the meta-analysis. The sensitivity rates and relative risk for MRI, before and after vaginal contrast medium administration, were pooled, and their 95% confidence intervals (CIs) were determined. RESULTS: The pooled sensitivity rate for MRI before administering intravaginal contrast medium in detecting pelvic pathologies was 63% (95% CI, 54%-72%), and that after was 89% (95% CI, 83%-93%). The interstudy heterogeneity rate (assessed using the I statistic) was relatively low: 13% (P = 0.33) and 0% (P = 0.45) before and after vaginal contrast medium use, respectively. The average relative risk was 1.54 (SD, 0.22; 95% CI, 1.18-1.89; median, 1.50; range, 1.34-1.80). This demonstrated that, on average, the sensitivity rate for MRI in detecting pelvic disorders increased by 54% after the use of a vaginal contrast medium. CONCLUSIONS: Use of vaginal contrast media improved the diagnostic ability of MRI in identifying pelvic pathologies.

Prognostic value of perihematomal edema area at the initial ED presentation in patients with intracranial hematoma.

OBJECTIVE: Intracerebral hemorrhage (ICH) is a potentially life-threatening condition. Interventions and treatments should be managed on time to reduce mortality. It has been put forth that perihematomal edema absolute volume (PHEAV) is related to mortality, however the effect of perihematomal edema absolute area (PHEAA) on mortality is unknown. The objective of this study was to evaluate the effect of PHEAA on 30-day mortality in patients with ICH. METHODS: Patients were screened with ICD-9, retrospectively. 106 patients were included in the study. Clinical data were obtained from the patient files. Computed tomography (CT) was acquired from the hospital imaging database. PHEAV and PHEAA were measured via CT by two clinicians blinded to the study protocol. The predictors of 30- day mortality were examined. RESULTS: Forty-three (40.6%) patients died within 30days. Older age, lack of trauma, low Glasgow coma scale and high blood glucose were associated with high mortality (P≤.001). PHEAV and PHEAA values were higher in nonsurvivors (P<.001). PHEAA was detected as an independent predictor of 30-day mortality. The cutoff value of PHEAA for mortality was 33.41cm(2) (sensitivity: 84.4%, specificity: 59.0%). There was no difference between receiver operating characteristic curves of PHEAA and PHEAV (P=.55). CONCLUSION: In contrast to PHEAV, PHEAA is a simple value which can be measured without the requirement of any additional techniques or extra costs which can be quickly applied and which is an independent indicator of 30-day mortality. PHEAA can accelerate physician interventions for patients with ICH within several hours of ED admission.

The Prevalence of Incidentally Detected Idiopathic Misty Mesentery on Multidetector Computed Tomography: Can Obesity Be the Triggering Cause?

PURPOSE: Misty mesentery appearance is commonly reported in daily practice, usually as a secondary finding of various pathological entities, but sometimes it is encountered as an isolated finding that cannot be attributed to any other disease entity. We aimed to assess the prevalence of cases with incidentally detected idiopathic misty mesentery on computed tomography (CT) and to summarize the pathologies leading to this appearance. METHODS: Medical records and initial and follow-up CT features of patients with misty mesentery appearance between January 2011 and January 2013 were analysed. The study included cases with no known cause of misty mesentery according to associated CT findings, clinical history, or biochemical manifestations, and excluded patients with diseases known to cause misty mesentery, lymph nodes greater than a short-axis diameter of 5 mm, discrete mesenteric masses, or bowel wall thickening. RESULTS: There were a total of 561 patients in whom misty mesentery appearance was depicted on abdominopelvic CT scans. A total of 80 cases were found to have isolated incidental idiopathic misty mesentery, giving a prevalence of 7%. The common indication for CT examination was abdominal pain. There was a slight female predominance (51.3%). 67.5% of all patients were classified as obese and 17.5% as overweight. CONCLUSIONS: The results of the present study show that idiopathic incidental misty mesentery appearance has a significant prevalence. Also, the high body mass index of these patients and the growing evidence of obesity-induced inflammatory changes in adipose tissue are suggestive of an association between obesity and misty mesentery appearance on CT.

Apparent Diffusion Coefficient analysis of encephalitis: A comparative study with topographic evaluation and conventional MRI findings.

OBJECTIVE: Our purpose was to reveal the efficiency of diffusion weighted imaging (DWI) in the diagnosis of encephalitis, and to determine the relation between the apparent diffusion coefficient (ADC) values, the onset of the clinical symptoms, and the lesion extent. METHODS: Conventional magnetic resonance imaging (MRI) was performed in 17 patients with encephalitis diagnosed on the basis of laboratory, clinical and radiologic findings during 2009 and 2015. Based on the duration between the onset of the symptoms and the brain MRI findings, the patients were divided into three groups. ADC values of the encephalitis lesion, the lesions' topographic analysis score, deep gray matter involvement, patients' clinical situation and the duration of the arrival to the clinic was examined. RESULTS: Mean ADC values were 0,988±0,335 x10(-3) mm(2)/s in group I (0-2 days), 1,045±0,347 x10(-3) mm(2)/s in Group-II (3-7 days), 1,451±0,225 x10(-3) mm(2)/s in Group-III (8 days and over). The relation between the ADC values and the duration of the arrival, topographic analysis score, the relation between the patients' clinical situation and the deep gray matter involvement were found to be statistically significant. The deep gray matter involvement was demonstrated more clearly by FLAIR images when compared with DWI. CONCLUSION: Conventional MRI sequences may be insufficient in showing the encephalitis lesion. DWI must be added to the imaging modalities immediately in the cases suspected of having encephalitis.

Infantile Type Sandhoff Disease with Striking Brain MRI Findings and a Novel Mutation.

BACKGROUND: Sandhoff disease is an autosomal recessive disorder caused by ß-hexosaminidase deficiency in which the ganglioside GM2 and other glycolipids accumulate intracellularly within lysosomes. This process results in progressive motor neuron manifestations, death from respiratory failure and infections in infantiles. CASE REPORT: This report presents a 22-month-old girl with infantile type Sandhoff disease that was hospitalized for generalized seizures and psychomotor retardation. She was diagnosed with a genetically proven novel mutation and by demonstrating it's specific imaging findings. CONCLUSIONS: Determination of spesific changes in neuroimaging which are initial findings for GM2 gangliosidosis is important from the point of diagnosis and follow-up in infants suspected of having a neurodegenerative disease.

An unusual infection of cervicofacial area caused by dental pathology: flesh-eating syndrome.

Necrotizing fasciitis (NF) of the cervicofacial area is highly rare, but physicians should be familiar with the presentation of this situation owing to the suddenness of its beginning, the rapidness of its spread, and ending with high mortality and morbidity. In this article, 5 patients with NF admitted to emergency department with dental pathology history were discussed with a review of the literature. The purpose of this case series is to raise awareness about NF of the cervicofacial area caused by dental pathologies. Five patients admitted to our emergency department between January 2012 and March 2015 and diagnosed as having cervicofacial NF were identified. All patients had dental pathologies. The parameters of the study were patients' age, sex, complaints, self- and family histories, physical examinations' findings, routine laboratory-computed tomographic findings, treatment, and complications. Two of the patients were older than 70 years. One of the patients was healthy but he lost time because of an inappropriate treatment. These 3 patients died. The remaining patients were discharged at the end of the prolonged and intensive treatment. Necrotizing fasciitis should always be remembered in the diagnosis of the infection of the cervicofacial area. Because of difficulty in its diagnosis, a delay in the treatment may result in a horrific outcome.

Association of breast arterial calcification and osteoporosis in Turkish women.

OBJECTIVE: Breast arterial calcification (BAC), medial calcific sclerosis of small to medium-sized muscular arteries, is a benign finding of mammographic evaluation. Previous studies have shown the relationships between BAC and systemic disorders such as cardiovascular disease, diabetes mellitus and hypertension. The aim of this study was to determine the association between reduced bone mineral density and BAC. METHODS: The study population consisted of 567 women who had both mammography and bone mineral density evaluation. BAC (+) and BAC (-) women were compared for age, body mass index, postmenopausal duration, number of deliveries, breastfeeding duration, DM, HT, lipid treatment, osteopenia, and osteoporosis. RESULTS: BAC was seen in mammographic evaluation of 179 women and 388 subjects without BAC accepted as the control group. There was a statistically significant relationship between age, postmenopausal duration, number of deliveries, history of DM, HT, lipid treatment and BAC. While the prevalence of osteopenia was higher in control group (52.8%), the rate of osteoporosis (48.7%) was higher in group with BAC. CONCLUSION: There was statistically significant relationship between BAC and osteoporosis in postmenopausal women. Determination of BAC in routine screening mammography might be helpful in both identifying women with risk of cardiovascular disease and osteoporosis.

Association of Chiari I malformation and cerebellar ectopia with sensorineural hearing loss.

We aimed to examine the prevalence of cerebellar tonsil ectopia and Chiari 1 malformation in sensorineural hearing loss (SHL) that has, to the best of our knowledge, not been studied previously. Magnetic resonance imaging records of 166 subjects with SHL and 50 controls without known otologic disturbances were included in the study. A tonsils descent more than 2 mm was assumed as cerebellar ectopia, and a descent equal to or more than 5 mm was assumed as Chiari 1 malformation. A tonsil descent group was also formed by summation of both groups. Transverse diameters of bilateral intracranial vertebral arteries and transverse sinuses were also measured, and all parameters were analyzed using appropriate statistics. A significant difference of frequencies of Chiari 1, ectopia, and tonsil descent was detected between patients and controls. In comparison of cerebellar ectopia and Chiari 1 groups, SHL did not show any significant difference. The left lateral sinus diameter showed positive correlation with tonsil descent. There was no significant correlation for the diameters of other vessels. A powerful correlation was detected between SHL and age. In addition, right and vertebral artery diameters showed positive correlations with age. Chiari 1 malformation and cerebellar ectopia showed an association with SHL. These patients should also be evaluated for otologic disturbances. Further high-resolution magnetic resonance imaging studies to explain the exact cause of this currently unknown association seems required.

Evaluation of hippocampal infolding angle and incomplete hippocampal inversion in pediatric patients with epilepsy and febrile seizures.

PURPOSE: We aimed to investigate the frequency of incomplete hippocampal inversion (IHI) and the hippocampal infolding angle (HIA) in pediatric patients with no additional abnormal findings in the brain. METHODS: Pediatric brain magnetic resonance imaging (MRI) examinations conducted between September 2012 and February 2015 were screened and 83 patients with epilepsy, 49 patients with febrile convulsion, and 74 control patients were included in this retrospective study. Presence of IHI was evaluated and HIA was measured on MRI. RESULTS: IHI was found in 23 patients in the epilepsy group (27.7%), 15 patients in the febrile convulsion group (30.6%), and 14 patients in the control group (19.0%), with no significant difference between the groups (P = 0.27). Compared with the epilepsy and febrile convulsion groups, HIA was significantly larger in the control group in sections of the right cerebral pedincule, the left cerebral pedincule, and the right superior cerebellar pedincule. No correlation was found between the laterality of the epileptogenic focus in the epilepsy group and existence of IHI, nor between age and HIA values among the groups. CONCLUSION: Although IHI is not an uncommon abnormality in the normal pediatric population, decreased HIA is more frequently found in patients with epilepsy or febrile convulsions.

Assessment of Pineal Gland Volume and Calcification in Healthy Subjects: Is it Related to Aging?

PURPOSE: The human pineal gland is a small neuroendocrine organ which produces melatonin. The main goal of this study was to provide a reference range for pineal volume in all age groups and to determine calcified and noncalcified tissue and their proportions, which may be a reflection of melatonin production in all age groups, by using very thin computerized tomography (CT) slices. MATERIALS AND METHODS: A total of 167 outpatients had undergone cranial CT. Each of the subject's total pineal volume (TPV), calcified pineal volume (CPV) and noncalcified pineal volume (NPV) according to age groups were calculated in cubic millimeters. Also, proportion of calcification (POC) was noted. RESULTS: The median values were 88.5 mm3 (12.3 mm3-411mm3) for TPV, 74.3 mm3 (12.3 mm3-298 mm3) for NPV, and 3.9 mm3 (0 mm3-141 mm3) for CPV. POC showed a gradual increase from 0-49 years. In the ≥70 group, when compared with the 60-69 age group, CPV and POC values were significantly lower (P: 0.036, P: 0.034, respectively). CONCLUSION: This study brings a radiological point of view to the distribution of pineal calcification according to age that has a link with melatonin secretion.

A Rare Cause of Calcified Subdural Empyema and Ventriculitis in a Pediatric Patient: Achromobacter Denitrificans.

Intracranial infections in the pediatric age group are still important causes of morbidity in developing countries. A 2-year-old male patient presented with acute onset of seizures and loss of consciousness to our emergency department with a past history of being followed for hypogammaglobulinemia. Unenhanced computerized tomography scan of the brain revealed a right frontoparietal peripherally calcified extraaxial collection, brain edema and a left sided shift. Contrast enhanced magnetic resonance imaging revealed a subdural empyema associated with the brain parenchyma and the ventricular system. In spite of a decompression procedure and subsequent medical therapy, the patient succumbed on the 9. postoperative day. This is the first case report of a pediatric patient with subdural empyema and ventriculitis due to Achromobacter denitrificans.

Diagnostic value of diffusion weighted MRI and ADC in differential diagnosis of cavernous hemangioma of the liver.

AIMS: To investigate the use of diffusion weighted magnetic resonance imaging (DWI) and the apparent diffusion coefficient (ADC) values in the diagnosis of hemangioma. MATERIALS AND METHODS: The study population consisted of 72 patients with liver masses larger than 1 cm (72 focal lesions). DWI examination with a b value of 600 s/mm2 was carried out for all patients. After DWI examination, an ADC map was created and ADC values were measured for 72 liver masses and normal liver tissue (control group). The average ADC values of normal liver tissue and focal liver lesions, the "cut-off" ADC values, and the diagnostic sensitivity and specificity of the ADC map in diagnosing hemangioma, benign and malignant lesions were researched. RESULTS: Of the 72 liver masses, 51 were benign and 21 were malignant. Benign lesions comprised 38 hemangiomas and 13 simple cysts. Malignant lesions comprised 9 hepatocellular carcinomas, and 12 metastases. The highest ADC values were measured for cysts (3.782±0.53×10(-3) mm(2)/s) and hemangiomas (2.705±0.63×10(-3) mm(2)/s). The average ADC value of hemangiomas was significantly higher than malignant lesions and the normal control group (p<0.001). The average ADC value of cysts were significantly higher when compared to hemangiomas and normal control group (p<0.001). To distinguish hemangiomas from malignant liver lesions, the "cut-off" ADC value of 1.800×10(-3) mm(2)/s had a sensitivity of 97.4% and a specificity of 90.9%. To distinguish hemangioma from normal liver parenchyma the "cut-off" value of 1.858×10(-3) mm(2)/s had a sensitivity of 97.4% and a specificity of 95.7%. To distinguish benign liver lesions from malignant liver lesions the "cut-off" value of 1.800×10(-3) mm(2)/s had a sensitivity of 96.1% and a specificity of 90.0%. CONCLUSION: DWI and quantitative measurement of ADC values can be used in differential diagnosis of benign and malignant liver lesions and also in the diagnosis and differentiation of hemangiomas. When dynamic examination cannot distinguish cases with vascular metastasis and lesions from hemangioma, DWI and ADC values can be useful in the primary diagnosis and differential diagnosis. The technique does not require contrast material, so it can safely be used in patients with renal failure.

Ligamentum flavum thickening at lumbar spine is associated with facet joint degeneration: An MRI study.

OBJECTIVE: Degenerative changes in posterior elements of the spine such as thickening or hypertrophy of the ligamentum flavum (LF) may result in spinal stenosis. In the present study, we aimed to investigate the potential factors including age, intervertebral disc degeneration (IDD), facet joint degeneration (FJD), end plate degeneration (EPD), which may affect LF thickening and to reveal the relationship among those factors at each level of lumbar spine by evaluating the magnetic resonance images (MRI). METHODS: A total of 200 individuals with low back and/or leg pain complaints who had undergone lumbar MRI were included in this study. The thickness of LF, FJD, IDD and EPD were assessed at all lumbar levels. RESULTS: Totally 1000 end plates, 1000 intervertebral discs and 2000 facet joints were evaluated and the thicknesses of 2000 LFs were measured from MRI images of 200 patients (100 males and 100 females). The mean age was 46.87 ± 12.47 years. LF thickness was strongly associated with FJD especially on the ipsilateral side. Age and IDD were correlated at whole vertebral levels. The age related changes (LF thickness, FJD, IDD and EPD) were more prominent at L4-L5 vertebral level. However, gender had no effect on LF thickness. CONCLUSION: The results of this study suggest that LF thickening may occur independently or could be associated with FJD especially on the ipsilateral side and this relationship is due to the vertebral level. The degree of disc degeneration increases with age and age related changes may be predominantly observed at L4-L5 vertebral level.

Assessment of neural alterations in obstructive sleep apnoea syndrome: can apparent diffusion coefficient measurements be useful?

BACKGROUND AND AIMS: Our aim was to investigate whether neurological alteration in patients with obstructive sleep apnoea syndrome (OSAS) with apparently normal cerebral and cerebellar structures can be assessed by means of apparent diffusion coefficient (ADC) measurement and to investigate the association between OSAS severity and ADC values. METHODS: Following the acquisition of diffusion-weighted cranial magnetic resonance imaging, ADC measurements were performed in 24 different apparently normal cerebral and cerebellar structures, including the bilateral frontal and parietal cortices, insulae, cingulate gyri, hippocampi, frontal and parieto-occipital periventricular white matter (PWM), caudate nuclei, putamen, thalami, cerebellar hemispheres, pons and mesencephalon in 47 OSAS patients and 20 control subjects. The ADC values of the patients and the control group were compared. The association between the apnoea-hypopnoea index (AHI) and the ADC values of the patients were investigated. RESULTS: The ADC values in the bilateral frontal PWM were lower in the patient group than those in the control subjects (P < 0.05). The measurements in the right cingulate gyri of the OSAS patients exhibited significantly higher ADC values than those of the control group (P = 0.002). Bilateral thalamic ADC values in severe OSAS patients were significantly higher than those in mild and moderate OSAS patients (P < 0.05). CONCLUSION: The ADC measurement is a simple and effective technique to evaluate neural alteration of the brain in patients with OSAS. ADC measurements can also be useful in the evaluation of the association between the AHI and the degree of neural alteration in the central nervous system.

The fate of abstracts presented at Turkish national radiology congresses in 2010-2012.

PURPOSE: This study aims to evaluate the analysis and publication rates of abstracts presented at the Turkish National Radiology meetings in 2010-2012. METHODS: Abstracts presented in the national radiology meetings of 2010, 2011, and 2012 were included in the study. The presentations were classified according to presentation type (oral or poster presentations), study type, study design, imaged organ or body systems, imaging modalities, time interval between the presentation and the publication date, and the journal in which the article was published. The conversion rate of presentations into full-text articles in peer-reviewed journals were surveyed through PubMed. The time from presentation in the meetings to publication was determined. The distribution of journals was also demonstrated. RESULTS: The total number of presentations submitted in three national radiology meetings was 3,192. The publication rate was 11% for the 2010 meeting, 8.2% for the 2011 meeting, and 9.6% for the 2012 meeting. A total of 300 papers were published, with an average of 15 months (range, 0-42 months) between presentation and final publication. The first three refereed international journals with the most number of papers derived from these meetings were Diagnostic and Interventional Radiology, Clinical Imaging, and European Journal of Radiology. CONCLUSION: The overall publication rate of scientific abstracts from Turkey was lower than those from overseas countries. Encouraging the authors to conduct higher-quality research would raise the publication rate as well as improve the quality and success of our scientific meetings.

Alterations in pituitary gland volume in polycystic ovary syndrome: a structural magnetic resonance imaging study.

The purpose of this prospectively designed cross-sectional observational study was to evaluate the effect of polycystic ovary syndrome (PCOS) on pituitary gland volume (PGV) under the hypothesis that endocrinologic changes may lead to morphologic changes of the pituitary gland. Twenty-six PCOS patients and 31 control subjects underwent magnetic resonance imaging (MRI) of the pituitary. Informed consent was obtained from all subjects. PGV was significantly larger in PCOS patients than in control subjects. Luteinizing hormone/follicle-stimulating hormone ratio was the only predictor of PGV. The association between pituitary gland enlargement and PCOS should be kept in mind when pituitary hypertrophy is detected on MRI.

Comparison of four different pain relief methods during hysterosalpingography: a randomized controlled study.

BACKGROUND: Hysterosalpingography (HSG) is the most commonly used method for evaluating the anatomy and patency of the uterine cavity and fallopian tubes, and is an important tool in the evaluation of infertility. The most frequent side effect is the pain associated with the procedure. OBJECTIVES: To evaluate four analgesic methods to determine the most useful method for reducing discomfort associated with HSG. METHODS: In the present prospective study, 75 patients undergoing HSG for evaluation of infertility were randomly assigned to four groups: 550 mg of a nonsteroidal anti-inflammatory drug (NSAID) (group 1); 550 mg NSAID + paracervical block (group 2); 550 mg NSAID + paracervical analgesic cream (group 3); or 550 mg NSAID + intrauterine analgesic instillation (group 4). A visual analogue scale was used to assess the pain perception at five predefined steps. RESULTS: Instillation of the liquids used for HSG was found to be the most painful step of HSG, and this step was where the only significant difference among groups was observed. When comparing visual analogue scale scores, group 2 and group 3 reported significantly less pain than the other groups. Group 1 reported significantly higher mean (± SD) scores (7.2 ± 1.6) compared with groups 2 and 3 (4.7 ± 2.5 and 3.8 ± 2.4, respectively) (P<0.001). In addition, group 2 reported significantly less pain than group 4 (4. 7 ± 2.5 versus 6.7 ± 1.8, respectively) (P<0.02). CONCLUSIONS: For effective pain relief during HSG, in addition to 550 mg NSAID, local application of lidocaine cream to the posterior fornix of the cervix uteri and paracervical lidocaine injection into the cervix uteri appear to be the most effective methods.