An extraordinary case in whom gastrointestinal stromal tumor and low-grade malignant lymphoma are seen together in the stomach.

INTRODUCTION: Gastrointestinal system (GIS) is the most common site of involvement of all primary extranodal lymphomas. Gastric lymphoma constitutes 3-6% of all primary stomach malignancies. Stomach is also the commonest site of involvement of gastrointestinal stromal tumors (GIST). We would like to report these rare synchronous tumors in the same patient. CASE: A 68-year-old male was admitted to the internal medicine clinics with the complaints of abdominal distension. Physical examination was normal. On abdominal computed tomography a 12 x 14 x 22 cm sized giant tumoral mass was detected in left hypochondrium. A total gastrectomy was performed. Two distinct neoplasms were detected; one of which was located in the posterior wall of the stomach with the size of 24 x 16 x 13 cm, and the other one was localized in the fundus of the stomach and its size was 6 x 5 x 2 cm. Pathological evaluation revealed the diagnosis of GIST at the posterior wall and low-grade malignant lymphoma from the mass localized in the fundus of the stomach. DISCUSSION: Two primary tumors are not seen so often together in the stomach. Adenocarcinoma and associated tumors including gastric lymphoma (especially MALT lymphoma), carcinoid, leiomyosarcoma and rhabdomyosarcoma constitute most of the reported series. Rarely adenocarcinoma and associated GIST cases were reported. It is important to report concurrent gastric lymphoma and GIST case since it is extremely rare in the English literature.