Asymptomatic Giant Adrenal Myelolipoma

Adrenal myelolipomas are nonfunctioning benign tumors composed of adipose tissue and hemopoietic elements resembling bone marrow. Before the availability of modern imaging,they were detected only at autopsy with an incidence of 0.08% to 0.2%.(1) These tumors are now being picked up more frequently with the availability of computedtomography and ultrasonography, but they are usually small and isolated.(2) The first excision of a myelolipoma was carried out in 1922. Since then, more than 100 cases of surgically resected adrenal myelolipomas have been documented. The managementof incidentally found tumors and their pre-operative diagnosis is discussed. We describe the largest asymptomatic adrenal myelolipoma weighing 5.5 kg.