Although several hypotheses have been proposed as to the cause of<unk> , the causative process is still not clearly understood. Recent experimental evidence suggests that both the myeloid and lipomatous elements have a monoclonal origin, which strongly supports the hypothesis that<unk> s are neoplastic lesions. Older theories proposing a non-neoplastic origin include the following: * Adrenal cortical cells, or other cells within the stroma of the adrenal cortex that are able to differentiate, may reversibly change into fat or blood-forming cells. This might occur because of the actions of adrenal cortex hormones, or of hormones released by the pituitary gland that act on the adrenal glands, such as adrenocorticotropic hormone (ACTH). * The blood-forming cells may arise by differentiation of cells within the capillaries of the adrenal gland. *<unk>  simply represents a site of normal blood formation outside the bone marrow.
Myelolipoma
Angiolipoma
Angiomyolipoma
Pyomyoma
Neuroma
Myxoma
Ameloblastoma
Myxoid tumor