Presentation of a new case of unilateral cystic pyeloureteritis in a 46-year old female patient. The condition presented as a right renoureteral colic. A revision is made of the 69 national cases published on such an uncommon condition, of obscure etiologic, pathogenic and therapeutical features. The accent is placed on its most significant aspects, such as: difficulties of differential diagnosis with other repletion defect imagen in the excretory tract and their frequent association to other diseases.