[Retroperitoneal malignant lymphoma showing follicular type: report of a case].

We report a case of retroperitoneal follicular malignant lymphoma. A 59-year-old man visited the hospital with the chief complaint of a loss of body weight and left epigastric tumor. CT revealed a tumor, 9 x 6 cm, with non-homogeneous density in the left retroperitoneum. Since no clinical metastasis was identified, the tumor and the left kidney were resected en bloc with para-aortic lymph node dissection. Pathological diagnosis was non-Hodgkin follicular lymphoma of mixed small cleaved and large cell type with lymph node metastasis (2/23). The CHOP adjuvant chemotherapy (cyclophosphamide, adriamycin vincristine, Prednisolone) and the radiation therapy were performed after the operation. Recurrence in the mediastinal lymph node occurred 7 months after operation and radiation and the same adjuvant chemotherapy were performed and resulted in complete remission. The patient remained free of the tumor for 27 months at present.