Solitary angiomyolipoma of the liver. Report of a case with diagnosis by fine needle aspiration biopsy.

Solitary angiomyolipoma is a benign tumor that rarely develops in the liver. The preoperative diagnosis of this lesion is of great value because of the therapeutic implications. Radiologic findings are relatively characteristic but not specific. A case of giant angiomyolipoma of the liver is described in which ultrasonography, computed tomography and magnetic resonance imaging were insufficient to establish the diagnosis. Fine needle aspiration biopsy (FNAB) was performed, showing bundles of smooth muscle cells intermingled with fat mature cells, characteristic of this lesion. FNAB may be a valuable method of establishing a definitive diagnosis of hepatic angiomyolipoma.