Two Cases of Colliding Carcinoma of the Stomach

Keishiro Aoyagi, Ken Hashimoto, Kikuo Kohfuji, Takaho Tanaka, Iseei Kodama, Shojiro Yano, Junji Ohta, Jinryo Takeda, Teruo Kakegawa

First Department of Surgery, School of Medicine, Kurume University

We report two rare cases of a collision tumor in the stomach. In case 1, a 72-year-old man was admitted to our hospital because of epigastralgia. Roentgenographic and endoscopic examinations of the stomach revealed a large lesion having the appearance of a Borrmann type-2 cancer in the lesser curvature. Total gastrectomy was performed, and examination of the resected specimen showed a Borrmann type-2 lesion together with a IIa lesion located close to each other. Histologically, the Borrmann type-2 lesion was a poorly differentiated adenocarcinoma infiltrating into the serosa, while the IIa lesion was a well-differentiated tubular adenocarcinoma localized in the mucosa. In case 2, a 52-year-old man was admitted to our hospital also because of epigastralgia. Roentgenographic and endoscopic examinations of the stomach revealed a lesion having the appearance of a mixed type IIa+IIc early gastric cancer in the posterior wall of the antrum. Distal gastrectomy was performed, and examination of the resected specimen showed a IIa type lesion together with a IIc type lesion located close to each other. Histologically, the IIa type lesion was a well-differentiated tubular adenocarcinoma infiltrating into the submucosa, whereas the IIc lesion was a poorly differentiated adenocarcinoma localized in the mucosa. In each of these two cases, serial sections of the area where the two carcinomas collided with each other revealed no histological transition between them. Thus, the histological findings of the two cancerous lesions correspond well with the concept of collision carcinoma.

Key words
collision tumor, gastric cancer

Reprint requests
Keishiro Aoyagi First Department of Surgery, School of Medicine, Kurume University
67 Asahi-machi, Kurume, 830 JAPAN

Accepted
April 1, 1992

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