Affiliation:
1. Department of Urology Teikyo University School of Medicine Tokyo Japan
2. Department of Pathology Teikyo University Hospital Tokyo Japan
3. Department of Radiology Teikyo University School of Medicine Tokyo Japan
Abstract
IntroductionRetroperitoneal tumors account for 0.2% of all neoplasms. Among these tumors, retroperitoneal vascular malformations are particularly rare, with most previously reported cases being venous malformations.Case presentationA 72‐year‐old woman was diagnosed with a retroperitoneal tumor on abdominal computed tomography. The 27‐mm diameter tumor was located away from the right kidney and major vessels in the right perirenal adipose tissue. Contrast‐enhanced computed tomography revealed a heterogeneously enhanced tumor with well‐defined borders. Dynamic contrast‐enhanced magnetic resonance imaging revealed rapid enhancement in the arterial phase and a progressive filling‐in pattern in the delayed phase. Although vascular malformation was suspected, a definitive diagnosis could not be established. The retroperitoneal tumor was excised laparoscopically for therapeutic and diagnostic purposes, and the histopathological diagnosis confirmed it as a capillary arteriovenous malformation.ConclusionHerein, we presented a rare case of retroperitoneal capillary arteriovenous malformation that was difficult to definitively diagnose preoperatively.