PMC6378837_01
Preoperative endoscopic examination and endoscopic ultrasonography.. (A) Endoscopic image of the submucosal tumor. The surface of the lesion is covered by non-malignant mucosa with erosion (arrow).. (B) Endoscopic ultrasound examination showed a well-defined hypoechoic mass (22 x 12 mm), which originates from the submucosal layer of the stomach.
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Endoscopic examination of the gastrointestinal tract revealed SMT (approximately 30 mm in diameter) located at the lower gastric body and with erosion on the top of the tumor (Fig. 1A). Endoscopic ultrasonography (EUS) revealed that the tumor presented as a well-defined hypoechoic mass (22 x 12 mm) arising from the submucosal layer of the stomach (Fig. 1B).
Histological features. Components of a poorly differentiated adenocarcinoma invaded the muscularis propria. The tumor was almost entirely covered with non-malignant epithelial mucosa.
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Although the tumor invaded the muscularis propria, the tumor surface was covered with non-malignant epithelial mucosa (Fig. 2).