Retroperitoneal Bronchogenic Cyst: A Rare Diagnosis of a Retroperitoneal Mass.

Bronchogenic cysts (BCs) are rare clinical entities caused by the abnormal budding of the tracheobronchial tree during embryogenesis. This foregut anomaly is usually found in the thorax. Retroperitoneal bronchogenic cysts (RBCs) are extremely uncommon and usually located near the left adrenal gland. A definitive diagnosis can only be reached with surgical resection and histopathology. We report the case of a 52-year-old female with an RBC found incidentally on CT imaging and managed with surgical resection. Despite the rarity of RBCs, they should be considered in the differential diagnosis of patients with a retroperitoneal mass. Surgery is the standard treatment of choice. This case report is unique as it describes the rare occurrence of an RBC located adjacent to the right kidney.