PMC3999576_01
The resected specimen revealed three independent type 0-IIc early carcinomas in the forecourt of the pylorus and in the pylorus.
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F1
T1N0M0 (fig. 1). During operation a mass 2.0 x 3.0 cm in size was observed in the omentum near the cecum.
Histological findings of the resected specimen from the type 0-IIc early gastric carcinoma within the submucosa (a). High-power photomicrography revealed signet ring cell carcinoma (b).
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F2
No. 2: 0-IIc, T1b(sm), sig.; No. 3: 0-IIc, T1a(m), sig.) (fig. 2). No regional lymph node metastases were seen.
Grossly, the peritoneal lesion showed a tumorous growth measuring 2.0 x 3.0 cm (a). Microscopically, the lesion was composed of tumorous proliferation of small lymphocytes (b). The lymphoid cells were composed of centrocytic and monocytic lymphoma. Little atypia was seen. A few mitotic figures were present. No lymphoepithelial lesions were seen. Plasmacytic differentiation was noted. Immunohistochemically, the lymphoid cells were positive for CD20 (+++) (c) and CD138 (++) (d), and Ki67 labeling was 10% (e). CD30 was negative for staining (f).
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F3
Grossly, the peritoneal lesion showed a tumorous growth measuring 2.0 x 3.0 cm (fig. 3a). Microscopically, the lesion was composed of tumorous proliferation of small lymphocytes (fig. 3b). Immunohistochemically, the lymphoid cells were positive for CD20 (+++) (fig. 3c), CD79a (++), CD138 (++) (fig. 3d), Ki67 (labeling = 10%) (fig. 3e), CD45RO (+), l-chain (+++), k-chain (+) and CD15 (+++), and negative for cytokeratin AE1/3, cytokeratin CAM5.2, CD3, CD30 (fig. 3f), CD10, CD34, CD56 and p53.