A Case of Coexisting Malignant Lymphoma and Adenocarcinoma Occurring as a Collision Tumor in the Remnant Stomach after Distal Gastrectomy

Satoshi Takahashi, Atsushi Nashimoto, Satoru Nakagawa, Hiroshi Yabusaki and Tamaki Ohta*

Division of Surgery and Division of Pathology*, Niigata Cancer Center Hospital

A collision tumor involving malignant lymphoma and adenocarcinoma in the remnant stomach is extremely rare. A 79-year-old man had undergone distal gastrectomy for malignant lymphoma of the duodenum (non-Hodgkin lymphoma, diffuse, small B cell type) 12 years earlier. An ulcerating tumor was found at the gastrojejunal anastomosis and endoscopic tumor biopsy indicated poorly differentiated adenocarcinoma, necessitating total remnant stomach resection. Pathological examination showed a collision tumor of malignant lymphoma (non-Hodgkin lymphoma, diffuse small B cell type, fSM) and adenocarcinoma (por1, fMP) with no nodal metastasis. Clinically, no evidence of recurrence was seen during follow-up. The man died of severe pneumonia two years after the second operation.

Key words
remnant stomach, gastric cancer, malignant lymphoma

Reprint requests
Satoshi Takahashi Digestive and General Surgery, Niigata University
1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510 JAPAN

Accepted
June 18, 2008

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