Nontraumatic Paraureteral Urinoma in a Cat with Urolithiasis

Abstract

Urinoma is an encapsulated collection of urine due to a disruption in the collection system of the urinary tract. This condition is rarely reported in veterinary medicine. The aim of this study is to describe the clinical and diagnostic findings of a well-encapsulated paraureteral urinoma associated with urinary tract stones in a critical feline patient. The ultrasound examination of the abdomen revealed a well-defined collection of anechoic fluid containing the left kidney in the retroperitoneal space, while the radiographic examination revealed a loss of soft tissue contrast in the lumbar region. Both techniques confirmed the presence of stones in the bladder. Following the ultrasound-guided drainage of the lesion, the nature of the fluid was also confirmed to be urine. Due to the worsening of the cat’s health, to better define the extent and genesis of the lesion, a positive contrast radiographic study was performed by means of an ultrasound-guided percutaneous injection of a contrast medium into the lesion, which highlighted a wide and homogeneous radiopaque area in the left retroperitoneal space. These findings were confirmed with a postmortem examination, corroborating the diagnostic suspicion of urinoma. The percutaneous contrast inoculation performed in this critically ill patient plays a role in the diagnostic process to reach a final diagnosis in cases in which the patient’s clinical condition does not allow for performing an excretory positive contrast study.

Pyelonephritic end-stage kidney and ureterocutaneous fistula in a Shetland pony

“… 6 In addition to surgery-associated lesions of the ureter, trauma during dystocia and urolithiasis can cause para-ureteral pseudocysts (urinomas) as a result of urine leaking into the peritoneum and inciting severe fibroblastic inflammation. 5 , 8 We cannot rule out that the para-ureteral fat necrosis that we noted near the urinary bladder orifice of the right ureter was initially a urinoma.…”

Comparação entre padrões de sutura longitudinal e transversal na ureterotomia microcirúrgica em coelhos

“…Após o diagnóstico de uroabdômen é necessário prosseguir para o tratamento dessa complicação, no qual pode ser clínico ou cirúrgico (HORNSEY et al, 2021) , 2002;MANZINI et al, 2020;TABBÌ et al, 2022).…”