Adrenocorticotropic hormone independent macronodular adrenal hyperplasia (AIMAH) is a rare cause of Cushing syndrome with characteristics of nodular enlargement of both adrenal glands that produce excess cortisol. The disease presents a bimodal age distribution with a rare subset presenting in the first years of life, particularly associated to McCune-Albright syndrome. Most patients present in their fifth or sixth decade. The adrenal glands can be massively enlarged bilaterally with the presence of numerous macronodules; however diffuse adrenal enlargement without nodules has been described. AIMAH is most often reported as sporadic but there are increasing reports of familial cases with autosomal dominant transmission. [from SNOMEDCT_US]
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