Adrenal myelolipoma is an uncommon, benign and hormonally inactive tumor. Most lesions are asymptomatic and usually are discovered incidentally at autopsy studies. Authors report on 6 patients (5 women, 1 man) with adrenal myelolipomas (5 right, 1 left), analyze their morphological findings and association with an adrenal hormonal overproduction. Five of the patients underwent surgery because of tumor size, in 3 of them histological evaluation confirmed myelolipoma and in 2 cases an adrenocortical adenoma with foci of myelolipoma. All the patients were asymptomatic and in 4 cases hormonal overproduction was not found. One female patient has oveproduction of dehydroepiandrosteron-sulphate (DHEAS) indicating a 3beta hydroxylase deficiency in this tumor and 1 patient has primary aldosteronism with a histological finding of an association of adrenocortical adenoma with foci of myelolipoma. Neither Cushings syndrome nor congenital adrenal hyperplasia were present in our group of patients.
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