A big encapsulated adrenal mass with well-circumscribed margin

We present a case on adrenal schwannomas. The CT shows enhancement of distal adrenal gland lesion. We named it rabbit tail sign. Adrenal schwannomas are rare and presents a very small proportion of retroperitoneal schwannomas. It tends to be misdiagnosed because of lacking characteristics clinical presentations and CT features. And there is debate about its origination. The rabbit tail sign of distal adrenal gland is one typical radiographic feature of adrenal schwannomas. It also suggests the tumor may originate from dominate nerve of adrenal medulla.