MR diagnosis of SCC arising within ovarian cystic teratomas: analysis of mural nodule characteristics.

PURPOSE: This study aims to evaluate and identify magnetic resonance (MR) findings of mural nodules to detect squamous cell carcinoma arising from ovarian mature cystic teratoma (SCC-MCT). METHODS: This retrospective study examined 135 patients (SCC-MCTs, n = 12; and benign MCTs, n = 123) with confirmed diagnoses across five different institutions between January 2010 and June 2022. Preoperative MR images for each patient were independently assessed by two experienced radiologists and analyzed following previously reported findings (PRFs): age, tumor size, presence of mural nodules, size of mural nodule, and the angle between mural nodule and cyst wall (acute or obtuse). Furthermore, this study evaluated four mural nodule features-diffusion restriction, fat intensity, Palm tree appearance, and calcification-and the presence of transmural extension. RESULTS: There were significant differences between the SCC-MCT and benign MCT groups in terms of all PRFs and all mural nodule findings (p < 0.01). Among the PRFs, "tumor size" demonstrated the highest diagnostic performance, with a sensitivity of 83.3% and a specificity of 88.6%. A combination of the aforementioned four mural nodule findings showed a sensitivity and specificity of 83.3% and 97.6%, respectively, for the diagnosis of SCC-MCT. Regarding diagnosis based on a combination of four mural nodule findings, the specificity was significantly higher than the diagnosis based on tumor size (p = 0.021). Based on these mural nodule findings, three SCC-MCT patients without transmural invasion could be diagnosed. CONCLUSION: Mural nodule MR findings had a higher diagnostic performance than PRFs for SCC-MCT and can potentially allow early detection of SCC-MCTs.

Clinical characteristics of pneumoperitoneum with pneumatosis intestinalis detected using computed tomography: A descriptive study.

Pneumoperitoneum has always been considered a surgical emergency as it represents a perforation of the gastrointestinal tract. Although several cases of pneumoperitoneum with pneumatosis intestinalis (PI) have been reported, the characteristics of such cases remain unclear. The current study aimed to clarify the clinical characteristics of pneumoperitoneum cases with PI detected using computed tomography (CT).This descriptive study was conducted at a single center. In a total of 18,513 abdominal CT scans obtained between January 2010 and February 2017, extraluminal free air was detected in 254 examinations of 182 cases. The medical records and CT images of these 182 patients were retrospectively analyzed.Pneumoperitoneum with PI was detected through 23 examinations in 21 cases, and the average age of the patients was 80.1 years. The frequency was 0.12% in all abdominal CT examinations, but 24.7% in the 85 cases with extraluminal free air, excluding iatrogenic air. PI was classified as benign in 20 cases and as life-threatening in 1 case. The majority of cases with benign PI showed good general and local findings and little leukocytosis, while the case with life-threatening PI showed severe conditions. No evidence of bowel wall discontinuity, segmental bowel-wall thickening, perivisceral fat stranding, and abscesses were observed. Ascites were detected less frequently in the cases with PI than in the other pneumoperitoneum cases (P < .01). Pneumoperitoneum and PI occasionally recurred, and PI and/or extraluminal free air generally disappeared quickly.Pneumoperitoneum with PI is a relatively common condition in older patients, and the majority of cases are caused by benign PI. The characteristics of pneumoperitoneum cases with benign PI include well-maintained physical conditions, normal laboratory data, absence of CT findings indicative of peritonitis, and infrequent ascites. In pneumoperitoneum cases with PI, predicting whether the PI is benign or life-threatening is clinically very important, whereas the presence of extraluminal free air is considered to be insignificant.

Transcatheter arterial embolization for uncontrolled bleeding during endoscopic submucosal dissection of the stomach.

Bleeding during endoscopic submucosal dissection (ESD) is an important complication. Here, we report a case of early gastric cancer in which endoscopic hemostasis during ESD failed, hemostasis by transcatheter arterial embolization (TAE) was performed, and ESD was subsequently completed. ESD was scheduled for an 89-year-old male with a type IIa + IIc lesion located on the anterior wall of the gastric antrum. During ESD, bleeding started and then increased. Hemoclips were used but the bleeding could not be controlled. ESD could not be continued because of a poor field of vision. We decided on TAE for hemostasis of the bleeding. Celiac angiography clearly showed extravasation in a branch of the right gastric artery. TAE with a microcoil and gelfoam was performed through the right gastric artery. ESD was started again directly after TAE. We were able to completely resect the lesion with a good field of vision. No complications occurred after therapy. He was alive without recurrence at 18 months after ESD. Thus, TAE is suggested to be a useful hemostatic method during ESD.

Eosinophilic gastroenteritis with eosinophilic infiltration of the gall bladder.

Eosinophilic gastroenteritis (EG) is a rare disease of unknown etiology characterized by eosinophilic infiltration of the gastrointestinal tract wall with various gastrointestinal manifestations. Several organs in the digestive tract may be involved by EG, but biliary tract involvements are rare. We report here a case of EG with eosinophilic infiltration of the gall bladder. A 57-year-old man was admitted to the hospital complaining of abdominal pain and diarrhea. As ultrasonography and magnetic resonance imaging showed thickened gall bladder wall and debris in the neck of gall bladder, we performed cholecystectomy, but his symptoms were not improved. Esophagogastroduodenoscopy showed multiple erosions, redness and edema in the duodenum and stomach. Biopsy specimens from the duodenum and stomach showed infiltration of eosinophils, plasma cells and lymphocytes. Microscopic findings of resected gall bladder showed eosinophilic infiltration into the all layers of gall bladder wall without vasculitis. Based on these findings, EG with eosinophilic infiltration of the gall bladder was diagnosed. Following oral steroid administration, clinical symptoms were immediately improved. One month after the therapy, esophagogastroduodenoscopy did not show any findings of gastritis or duodenitis, and there were no eosinophilic infiltrations in biopsy specimens from duodenum and stomach.