Idiopathic unilateral adrenal hematoma: report of a case.

We report an unusual case of idiopathic unilateral adrenal hematoma, which was asymptomatic and unaccompanied by a hematologic disorder. The surgical specimen contained a large tumor comprised of subacute to chronic organized hematoma. The preoperative magnetic resonance imaging findings were compatible with characteristics reported previously, except for spotty strong enhancement in the peripheral part of the mass. It is important to differentiate this benign lesion from a neoplasm, although we were not able to identify it preoperatively and a precise diagnosis was only confirmed when the resected specimen was examined pathologically.