Mictoscopic:
Microscopically there is a ragged ulcer penetrating to within 5 mm of the serosal surface. The ulcer is surrounded by dense connective response and chronic inflammatory infiltrate. The edges are not heaped up, but several sections of the ulcer reveal malignant changes. The tumor is superficial and composed of poorly formed glands and sheets of malignant cells. The cells are pleomorphic with small amounts of eosinophilic cytoplasm. The nuclei are either pyknotic or large with prominent nucleoli and clumped chromatin. Mitoses are rare. The tumor proper does not extend below the mucosa, but a single nest of malignant cells is seen in a submucosal lymphatic space. The surgical margins are free of tumor.

Four perigastric lymph nodes show no evidence of metastatic spread.

There are two segments of large peripheral nerve.

Diegnosis:
Superficial spreading carcinoma rising in the margin of a chronic gastric ulcer - the surgical margins appear free of tumor.
Perigastric lymph nodes (4) without demonstrable metastases.