[A case of myelolipoma arising from accessory adrenal gland]

A case of adrenal myelolipoma is reported. The patient was a 74-year-old female who was admitted to our hospital. Ultrasonography and CT scan incidentally showed a left retroperitoneal tumor, located between the left kidney and the spleen. At the operation, we observed that the tumor separated from the normal left adrenal gland, and confirmed that the tumor had developed from the accessory adrenal gland. The resected tumor measured 61 x 42 x 40 mm in size and 60 g in weight. Histological findings were compatible with myelolipoma. We reviewed 104 cases of adrenal myelolipoma reported in the Japanese literature.