Suprarenal neurilemoma.

Retroperitoneal neurilemomas are rare tumors. They are usually asymptomatic, grow to a large size, and generally undergo cystic degeneration before they are discovered. There may be a palpable flank mass. Almost invariably excretory urography shosw renal or ureteral deviation, and arteriography usually reveals an avascular mass. We present a brief review of the literature and 2 case reports of suprarenal neurilemoma, a site of occurrence not previously reported. One suprarenal neurilemoma occurred in a two-year-old child. The other was removed from a fifty-two-year-old man, and in this case a thoracoabdominal approach was helpful.