A Serosa-Originated Gastric Stromal Tumor Misdiagnosed by Ultrasonography and Frozen Section Pathology: A Case Report.

Gastric gastrointestinal stromal tumor (GIST) is a mesenchymal neoplasm, typically arising from the muscularis propria layer of the stomach wall. Serosa-derived GIST is rarely seen and has not been reported yet. A 49-year-old Chinese female was presented with marked abdominal distension. Ultrasonography revealed a retroperitoneal tumor adjacent to the stomach wall with an intact structure of five echo layers, indicating a non-stomach tumor origin. Preoperative radiological studies suggested tight tumor-stomach adjacency, which was confirmed by intraoperative dissection. Initial frozen section indicated a pathological diagnosis of spindle cell tumor, which turned out to be a gastric GIST originated from the serosa layer of the stomach wall. The current case demonstrates the rare occurrence of serosa-derived GIST. This case also suggests difficulties in preoperative diagnosis of gastric GISTs, especially when uncommon pathological conditions like rare tumor origins were presented.

Giant Presacral Schwannoma in Man: Report of a Case with Emphasis on Imaging Findings.

BACKGROUND: Schwannoma is a tumor arising from peripheral nerve sheaths and commonly occurs in the head, neck, and upper and lower extremities. Schwannoma in the presacral space is relatively rare and is often misdiagnosed before pathologic diagnosis is made. CASE DESCRIPTION: Here we discuss a case of giant presacral schwannoma in a 34-year-old man with an emphasis on imaging findings. CONCLUSIONS: Solid and encapsulated, round or oval, with rich blood supply may be the characteristic imaging findings of presacral schwannoma, which may narrow the differential diagnosis of hypervascular pelvic lesions.

Successful management of diaphragmatic ectopic pregnancy using ultrasound-guided percutaneous microwave ablation.

Diaphragmatic ectopic pregnancy is a rare status during the perinatal period. We reported that a 24-year-old woman with diaphragmatic ectopic pregnancy successfully received ultrasound-guided percutaneous microwave ablation. It found that beta-human chorionic gonadotropin level decreased showing 1067, 311.3 and 118.4 mIU/mL within five postoperative days, and P level reduced from 3.64 to 1.59 nmol/L. Contrast-enhanced ultrasonography image on the third day after ablation indicated that there was no enhancement in the lesion. This case indicated that ultrasound-guided percutaneous microwave ablation could be critical for a good outcome in diaphragmatic ectopic pregnancy.