Development of a large adrenal myelolipoma in the context of long-term elevated ACTH.

Adrenal myelolipomas are the second most common benign tumours of the adrenal gland. Despite their frequent occurrence, there is uncertainty around their aetiology. We present the case of a giant adrenal myelolipoma that supports the role of prolonged adrenocorticotrophic hormone (ACTH) stimulation