Gastric adenocarcinoma mimicking a submucosal tumor: A case report

Figure 1 Endoscopic findings. A and B: A 1.6-cm type 0-Is lesion covered by congested mucosa on gastric angle was observed by white light endoscopy; C: Regular microvascular pattern, presence of a demarcation line, irregular and smaller crypt opening, and widened intervening part were observed by magnifying endoscopy with narrow-band imaging. Magnification: 40×; D: Endoscopic ultrasound showed a 15.3 mm × 9 mm hypoechoic mass within the submucosal layer and thickened mucosal and submucosal layers.

Figure 2 Abdominal computed tomography findings. A 15 mm × 12 mm protruding nodule was shown on the lesser curvature of the stomach.

Figure 3 Histopathological findings (hematoxylin and eosin staining). A moderately and poorly differentiated adenocarcinoma was suggested. A: The submucosal layer and muscularis mucosae were invaded; B: The tumor seemed to originate from the basal layer and invade towards the submucosal layer; C: The basal cutting edge was involved; D: Glands were arranged irregularly, with hyperchromatic nuclei and pathologic mitoses visible. Magnification: A: 40×; B and C: 100×; D: 200×.