A bronchogenic cyst is a developmental abnormality of the primitive ventral foregut. It is usually located in the chest but infradiaphragmatic. However, retroperitoneal locations are rare. Clinically it is usually asymptomatic and incidentally diagnosed, radiologically it is differentially diagnosed from adrenal mass, pancreatic cyst, enteric cyst, urothelial cyst but pathologically it is confirmed when there is bronchial tissue, such as respiratory epithelium, small muscle, serous and mucous gland, cartilage. A 61-year old woman was admitted suffering from epigastric pain. Computed tomography showed a 7cm sized cystic mass in the left adrenal area. The mass was excised and was found to be a bronchogenic cyst. Retroperitoneal bronchogenic cysts, although rare, should be considered in the diagnosis of a retroperitoneal mass.