A case of primary gastric malignant lymphoma with chylous ascites

: An 87-year-old man presented with appetite loss and abdominal distension. Routine blood tests revealed hypoproteinemia. Abdominal computed tomography revealed ascites, which was subsequently drained. Biochemical analysis of the ascitic fluid detected chyle. Esophagogastroduodenoscopy revealed nodular swelling of the mucosa, swelling folds, and widespread erosions in the stomach. Stage I diffuse large B-cell gastric malignant lymphoma was diagnosed on the basis of the Lugano International Conference classification system. Six courses of R-CHOP [rituximab, cyclophosphamide, hydroxydaunorubicin (doxorubicin), vincristine (Oncovin(®)), and prednisolone] therapy were administered, following which complete remission was achieved and the chylous ascites mostly disappeared.