To explore the basic information, pathology and clinical characteristics, diagnosis and efficacy of treatment.

The data of a 30-year-old man were analyzed at the Department of Urology of Guangdong Provicial People’s Hospital with an unexpected discovery of the left adrenal mass 1 month ago. The preoperative enhanced CT showed: in the left adrenal region, a round cystic low density mass was found, which was considered to be a left adrenal cystic mass. Retroperitoneal laparoscopic resection of the left adrenal gland tumor was performed for this patient, and intraoperative frozen examination showed that it was cystic lesions, which got no evidence of malignancy.

The intestinal duplication cyst was diagnozed after operation by pathology and clinical features. The patients recovered very well, and was followed, treatment associated with the best long-term outcomes.

Retroperitoneal intestinal duplication is rare in clinical, It has atypical clinical manifestation and not specific in imaging and laboratory examinations. Therefore, it is easy to be misdiagnosed in clinical practice. The clinical pathological diagnosis will be helpful, and surgical resection is the best treatment.