Abstract
A 20-year-old man admitted to our hospital because of melena had a palpable tumor with the size of an infant's head in the right lower quadrant of abdomen. Radiological examinations and histological study of the biopsy specimen taken by colonoscopy revealed that he had primary malignant lymphoma of the appendix, and right hemicolectomy with regional lymph node excision was performed. The histological diagnosis was non-Hodgkin lymphoma, diffuse large B cell type. Postoperative FDG-PET showed abnormal accumulation in the lymph nodes of the retroperitoneum and the mediastinum. Adjuvant chemotherapy (R-CHOP) was thus conducted, which induced complete response. He is doing well 2 years and 10 months after the operation without recurrence. We also review 39 cases reported in the Japanese literature.
