Collision Tumor of the Stomach

Kimitoshi Kubo; Ryo Takahashi; Noriko Kimura; Norishige Maiya; Soichiro Matsuda; Momoko Tsuda; Takeshi Mizushima; Masanori Ohara; Mototsugu Kato

doi:10.1159/000514395

Collision Tumor of the Stomach

Case Rep Gastroenterol. 2021 Mar 18;15(1):400-407. doi: 10.1159/000514395. eCollection 2021 Jan-Apr.

Authors

Kimitoshi Kubo¹, Ryo Takahashi², Noriko Kimura³, Norishige Maiya¹, Soichiro Matsuda¹, Momoko Tsuda¹, Takeshi Mizushima¹, Masanori Ohara², Mototsugu Kato¹

Affiliations

¹ Department of Gastroenterology, National Hospital Organization Hakodate National Hospital, Hakodate, Japan.
² Department of Surgery, National Hospital Organization Hakodate National Hospital, Hakodate, Japan.
³ Department of Pathology, National Hospital Organization Hakodate National Hospital, Hakodate, Japan.

Abstract

Collison tumor of the stomach is rare, and its endoscopic and pathological features remain poorly described. A 70-year-old woman was referred to our hospital for examination and treatment of undifferentiated gastric cancer. Esophagogastroduodenoscopy revealed a whitish, superficial elevated lesion in contact with a reddish, superficial depressed lesion from the anterior wall of the gastric angle and antrum to the lesser curvature. Laparoscopic distal gastrectomy was performed for preoperative diagnosis of suspected early gastric cancer presenting as a differentiated and undifferentiated collision tumor, which led to the lesion being diagnosed as collision tumor, tub1-tub2+por1-sig, pT1a (M), ly0, v0, N0, stage IA. To our knowledge, this report represents a valuable addition to the collision tumor literature describing a rare case of preoperatively diagnosed collision tumor of the stomach.

Keywords: Collision carcinoma; Collision tumor; Stomach.

Publication types

Case Reports