Mucocutaneous angiomyolipoma. A report of 2 cases arising in the nasal cavity.

Abstract

Angiomyolipoma (AML) is a distinctive tumor that usually occurs in the kidney and rarely in the liver. Angiomyolipoma of other sites is extremely rare, and, to our knowledge, only 2 cases have been described in the nasal cavity. We present 2 additional cases of AML of the nasal cavity and discuss the difference between them and renal AML. Two tumors in a 66-year-old man and an 88-year-old woman without tuberous sclerosis are described. They showed 20-mm, well-circumscribed, polypoid shapes. Histologically, they were composed of mature smooth muscle cells, fat cells, and various-sized blood vessels. In addition, aggregated small lymphocytes were noted. Neither epithelioid smooth muscle cells nor HMB45 immunoreactivity was seen in either case. The clinicopathologic features of AML of the nasal cavity are distinct from renal and hepatic AML and are common to those of AML arising in the skin and oral and pharyngeal mucosa. The term mucocutaneous angiomyolipoma is thought to be appropriate to express these characteristic tumors.