Lung mass found on chest x-ray
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A well-circumscribed fatty mass is seen in the right adrenal gland on these contrast enhanced images. This is most consistent with a benign myelolipoma. The differential diagnosis would include a benign lipoma which is much less common.
The third image was obtained three months later showing a stable appearance to the mass.
Adrenal myelolipomas are relatively rare benign adrenal masses containing fat and hematopoietic elements. Occasionally they occur elsewhere in the retroperitoneum.
Myelolipomas account for about 2.6% of primary adrenal masses and have a prevalence at autopsy of 0.06%. In contrast, lipomas account for only 0.7% of primary adrenal masses.