Crossed Fused Renal Ectopia with Single Ureter and Single Renal Vein: A Rare Case

Imaging features of renal ectopia and fusion in 13 cats

CASE SERIES SUMMARY

A retrospective multicenter case series of renal fusion anomalies in cats was investigated. The aim of this study was to describe the imaging characteristics (radiography, ultrasonography and CT) of renal ectopia and fusion in cats. A total of 13 feline patients (median age 9 years) were included in this multicentric retrospective study. Ultrasound was available in 12/13 cases, radiographs in 4/13 cases and CT in 3/13 cases. Of the 13 cases, seven were left to right fusions, four were right to left fusions, one was on the midline and one was in the pelvic inlet. Adopting a human classification system, there were five lump kidneys, four disc kidneys, one horseshoe kidney, one caudal ectopia, one L-shaped kidney and one pelvic kidney. In 2/13 cases, additional congenital malformations were noted, including an azygous continuation of the caudal vena cava and a peritoneal-pericardial diaphragmatic hernia.

RELEVANCE AND NOVEL INFORMATION

This study provides further description of the imaging findings in feline patients with fused renal ectopia. The morphologic characteristics of the fused kidneys in cats appear similar to what is published in the human literature. Renal fusion might be an incidental finding in cats, but further investigations are necessary to determine their clinical relevance.

Crossed fused renal ectopia (pancake type) with single ureter: A case report

Crossed fused renal ectopia is a rare congenital anomaly of renal embryogenesis. The majority of such anomalous kidneys are supplied by a single renal artery and drained by two separate ureters. However, drainage by a single common ureter is an unusual variant. Here, we present a 17-year old male with a pelvic pancake kidney drained by a single ureter with associated acute obstructive uropathy diagnosed with ultrasonography and computed tomography urography (CTU). We describe the anatomical peculiarity and diagnostic evaluation of the case.