case_images: PMC8559628_01
case_images: Nodular lesion in the posterior wall of third duodenal in abdominopelvic CT scan
case_images: cjim-12-447-g001.jpg
case_images: PMC8559628_01_cjim-12-447-g001.jpg
case_images: F1
case_images: The finding was a 10*12mm nodular lesion in the posterior wall of the third duodenal portion anterior to psoas muscle in the level of third lumbar vertebrae which had strong enhancement in arterioportal phase (fig. 1).
case_images: Third portion duodenal wall lesion estimated 12mm
case_images: cjim-12-447-g002.jpg
case_images: PMC8559628_01_cjim-12-447-g002.jpg
case_images: F2
case_images: During exploratory laparotomy after Kocher maneuver, a round shape, firm consistency lesion 12mm diameter in the third portion of duodenum originating from the seromuscular layer (fig. 2) was found which excised by enucleation without mucosal injury.
case_images: hematoxylin and eosin staining (left) 40X magnification image of a GIST; (right) immunohistochemistry view indicating spindle cells positive for CD117.
case_images: cjim-12-447-g003.jpg
case_images: PMC8559628_01_cjim-12-447-g003.jpg
case_images: F3
case_images: In pathologic study, low grade gastrointestinal stromal tumor with spindle cell type and 1/50 HPF mitotic rate without necrosis was reported (fig. 3). In immunohistochemistry assessment, CD117 was positive in tumoral cells (fig. 3), SMA and S100 were negative while CD34 was patchy positive and 2% of the tumor cells being positive for the proliferation marker Ki67.