A Case of Collision Tumor of Primary Malignant Lymphoma and Poorly-differentiated Adenocarcinoma in the Ascending Colon

Eiji Minato, Ippei Fujino, Nobuhito Sugihira, Kazuo Matsumoto and Kouichi Shima

Shingu Municipal Medical Center

An 80-year-old male was admitted to our hospital complaining of anemia and a right lower quadrant abdominal pain. A barium enema examination revealed a whole-circumferential stricture in the ascending colon. A colonoscopy visualized advanced colon cancer, and a biopsy specimen revealed a poorly differentiated adenocarcinoma. Right hemicolectomy with regional lymph node dissection (D2) was performed. The resected specimen revealed the tumor to be 10×8 cm in size. Histopathological examination revealed a collision tumor of primary malignant lymphoma and poorly differentiated adenocarcinoma. Collision tumors of malignant lymphoma and adenocarcinoma are rare, to our knowledge, this is only the fourth case to be reported in medical literature

Key words
malignant lymphoma, adenocarcinoma, collision tumor in the ascending colon

Reprint requests
Eiji Minato Shingu Municipal Medical Center
18-7 Hachibuse, Shingu, 647-0072 JAPAN

Accepted
September 24, 2003

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