Myelolipoma (myelo-, from the ancient greek μυελός, marrow; lipo, meaning of, or pertaining to, fat; -oma, meaning tumor or mass) is a benign tumor-like lesion composed of mature adipose (fat) tissue and haematopoietic (blood-forming) elements in various proportions.Myelolipomas can present in the adrenal gland, or outside of the gland. Symptoms and signs The majority of myelolipomas are asymptomatic. [Source: Wikipedia ]