腹膜后单发单纯性囊性病变少见,现将经病理证实的２例腹膜后单发单纯性囊性病变报告如下。病例例１,女,６１岁,右上腹肿物２年进行性增大伴胸闷、乏力１个月入院。体检:右上腹饱满,可及球形光滑的肿物,质韧、无压痛,余无阳性体征。影像学检查:Ｂ超示右上腹约１３３ｃｍ×１５８ Retroperitoneal simple single cystic lesions rare, now confirmed by pathology in 2 cases of single retroperitoneal simple cystic lesions are reported below. Case 1, female, 61 years old, right upper quadrant enlargement of 2 years of progressive increase with chest tightness, fatigue 1 month admission. Physical examination: full right upper quadrant, spherical and smooth the tumor, quality and tough, no tenderness, I no positive signs. Imaging examination: B ultrasound showed the right upper abdomen about 133cm × 158