Adrenal myelolipoma: preoperative diagnosis by fine-needle aspiration cytology.

Fine-needle aspiration (FNA) was performed under ultrasonographic guidance on a suprarenal mass in a 52-yr-old Japanese man. Preoperatively, the diagnosis of adrenal myelolipoma was easily established from the cytologic findings of the aspirates. FNA is a very useful technique for the differential diagnosis of this tumor, and it is particularly valuable for many hospitals that are not equipped with computed tomography.