Sections show a polypoid gastric mucosal lesion with complex branching villous and tubular architecture, lined by dysplastic columnar epithelium exhibiting nuclear stratification, hyperchromasia, and loss of polarity. Within the lesion, there are foci of intramucosal carcinoma characterized by crowded, irregular glands with marked cytologic atypia, luminal necrotic debris, and cribriforming, confined to the lamina propria without evidence of invasion beyond the muscularis mucosae. The surrounding stroma shows mild inflammatory infiltrate without desmoplastic reaction. No lymphovascular invasion is identified.
Gastric polypoid mass.
Soft tissue fragments collectively measured 0.8 cm, totally embedded.
Stomach, polypod mass, endoscopic biopsy: