myelolipoma

Nodular accumulations of cells derived from localized proliferation of reticuloendothelial tissue in the blood sinuses of the adrenal glands; grossly, the nodules may seem to be adipose tissue, but actually are foci of bone marrow containing erythropoietic or myeloid cells.

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my·e·lo·li·po·ma .mī-ə-lō-lī-'pō-mə, -lip-'ō-mə n, pl -mas also -ma·ta -mət-ə a benign tumor esp. of the adrenal glands that consists of fat and hematopoietic tissue

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my·elo·li·po·ma (mi″ə-lo-lĭ-poґmə) a rare benign tumor of the adrenal gland, several centimeters in diameter, composed in varying proportions of adipose tissue, lymphocytes, and primitive myeloid cells, probably a developmental abnormality.