Myelolipoma of the adrenal gland. Angiographic findings and review of the literature.

Myelolipoma of the adrenal gland is a rare tumor. It has been surgically excised in only five cases, including the one described in this report. However, review of the literature reveals a total of one hundred thirty cases. Although more than 96 per cent of these lesions were found incidentally at autopsy and more than half could be appreciated only microscopically, it is clear that these tumors can grow sufficiently to become symptomatic, undergo hemorrhage, and require operation. The clinical angiographic and pathologic features of myelolipoma are described. Although endocrine function of this tumor has never been demonstrated, related experimental evidence of others is summarized because it suggests that complete endocrinologic evaluation of patients with suspected myelolipoma is indicated. Despite the rarity of the tumor, we believe that the radiologic and clinical features of myelolipoma that we have described may allow preoperative diagnosis in the future.