We report a new case of benign retroperitoneal schwannoma arising from the adrenal gland.53 year old male with history of moderate benign prostatic hyperplasia under alpha blocker therapy who referred right flank discomfort for two months prior to last visit, without any other symptoms; radiologic examination with Ultrasound and CT scan and preoperative endocrine study were suggestive of non functioning adrenal tumour which was surgically extirpated.Anatomopathological report showed a benign juxta-adrenal schwannoma.It is an uncommon retroperitoneal tumour. The presence of cystic changes within a retroperitoneal tumour is relatively frequent in schwannomas and may suggest its diagnosis. The case we report did not have cystic structures.