[Contusion on horseshoe kidney. Apropos of 2 cases].

Based on the personal observation of two cases and a series of 40 patients reported in the literature, the specific problems related to injuries to horseshoe kidney are evoked. The first case involved crushing of the isthmus against the spine recognized at operation on the 5th day and suggested by urography, CT scan and arteriography data. Abstention from surgery in the second case was decided on initial urography and ultrasound findings and the rapid, spontaneously favorable course. A literature review failed to provide much original data related to the anatomical anomaly, too frequently detected during emergency surgery. The only particularity is related to rupture of isthmus which may damage upper excretory pathways; this explains the interest for the authors of pyelostomy in case of conservative surgery in this context. When surgery is indicated this should be reserved to severe forms and postponed. It is important to carry out arteriography in addition to urography and a CT scan because of the particularity of the vascularization of this type of kidney: the anterior transperitoneal approach appears to be the best adapted.