[Schwannoma with purely cystic form originating from the adrenal area: a case report].

A 62-year-old woman was hospitalized with complaints of right upper abdominal discomfort. Various imaging studies showed an extremely large suprarenal mass with solitary cystic formation. Partial adrenalectomy was successfully performed through the transperitoneal approach. The resected mass measured 12 x 10 x 10 cm and weighed 600 g. A pathological examination showed an Antoni-B predominant-type benign schwannoma containing a large volume of degenerative fluid. Our search of literature yielded few reports of solitary cystic schwannomas in the retroperitoneal cavity or throughout the body. This unusual cystic manifestation is thought to be a terminal stage of degeneration of a long-standing schwannoma.