输尿管囊肿(Ureterocele)在输尿管中所发现的"输尿管先天畸形"病症。此种病症称为输尿管囊肿症(ureteroceles)，输尿管气球产生在膀胱开口处，并形成一个"囊袋"(sac-like pouch)。经常伴随着"重复收集系统"(duplicated collection system)，其中，两条输尿管各自导流各自的肾脏、而不只用一条而已。简单的输尿管囊肿，其条件只涉及单一输尿管，仅代表20％左右的病例。输尿管囊肿影响到约有4000人，其中至少有五分之四是女性。患者往往是白人较多。

由于超声波的出现，大多数的输尿管囊肿可以在产前诊断出来。儿童及成人的输尿管囊肿病症往往发现可以经由医学影像合理的得知其病因、而不是仅怀疑其为输尿管囊肿而已。

A ureterocele is a congenital abnormality found in the ureter. In this condition called ureteroceles, the distal ureter balloons at its opening into the bladder, forming a sac-like pouch. It is most often associated with a duplicated collection system, where two ureters drain their respective kidney instead of one. Simple ureteroceles, where the condition involves only a single ureter, represents only twenty percent of cases. Ureteroceles affects one in 4,000 individuals, at least four-fifths of whom are female. Patients are frequently Caucasian.