Synchronous double primary malignant lymphoma of low grade malignancy and early cancer (collision tumor) of the stomach.

Collision tumors of the stomach are rare tumors, with about 32 cases reported in the English and German literature. In this report the case of a 65-year-old male with a synchronous primary malignant lymphoma (immunocytoma) and an early cancer of the stomach is presented. A total gastrectomy with esophago-jejunostomy was performed. Postoperatively the affected region was irradiated. 30 months later a re-evaluation did not reveal any recurrence of the disease. The diagnostic and therapeutic problems of collision tumors of the stomach and a possible relationship between the two tumors are discussed against the background of the literature.