Solid tumors associated with multiple myeloma have been demonstrated. However, it is a controversial subject whether there is a risk factor for the development of a secondary tumor. Here we reported a case with multiple myeloma and gastric adenocarcinoma. A 77 years old male patient was admitted with complaints of bone pain, left leg weakness, weight loss and epigastric pain. Patient's examination revealed monoclonal gammopathy, lytic bone lesions and infiltration of plasma cells in bone marrow. Endoscopic examination revealed a mass in the proximal stomach and pathological examination of ulcerated mass showed gastric adenocarcinoma.
Coexistence of these two disease entities needed to be explained by further large-scale researches.
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