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  • Title: Retroperitoneal capillary arteriovenous malformation mimicking a malignant neoplasm.
    Author: Yanagida K, Kaneko T, Saito K, Yamamoto M, Yamamoto A, Yamada Y, Nakagawa T.
    Journal: IJU Case Rep; 2023 Nov; 6(6):398-401. PubMed ID: 37928304.
    Abstract:
    INTRODUCTION: Retroperitoneal 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 PRESENTATION: A 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. CONCLUSION: Herein, we presented a rare case of retroperitoneal capillary arteriovenous malformation that was difficult to definitively diagnose preoperatively.
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