A case of gastrointestinal stromal tumor of the stomach showing extragastric growth detected on abdominal ultrasound during a medical check-up

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  • 人間ドックにおける腹部超音波検査を契機に発見された管外発育型胃GISTの1例

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Abstract

<p>In September 2019, a 36-year-old woman underwent abdominal ultrasound for a medical check-up at our hospital, and a mass measuring 38 mm in diameter was identified on the ventral side of the pancreatic body in contact with the stomach. Gastrointestinal radiography showed a submucosal tumor-like protrusion on the lesser curvature of the gastric angle. Computed tomography showed an extrinsic mass containing a cystic component with uneven contrast enhancement on the lesser curvature of the gastric angle. Upper gastrointestinal endoscopy showed a submucosal tumor measuring 30 mm in diameter on the lesser curvature of the gastric angle. Endoscopic ultrasound-guided fine-needle aspiration was performed, and the diagnosis of a gastrointestinal stromal tumor (GIST) was established. The patient then underwent laparoscopic partial gastrectomy. Histopathological examination showed that the tumor was positive for KIT and negative for CD34, with a mitotic count of 3/50HPF and an MIB-1 labeling index of 6.9%; thus, the tumor was classified as a low-risk GIST. Herein, abdominal ultrasound led to the detection and diagnosis of a GIST of the stomach showing extragastric growth.</p>

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