IJU case reports · 2026
Leiomyosarcoma of the Renal Vein That Enlarged Laterally While Preserving the Structure of the Renal Vein Lumen.
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Tashiro Naoki, Sakaki Yume, Fujinaga Akito, Nagai Takahiro, Onizuka Chie, Mukai Shoichiro, Umekita Yoshiko, Sato Yuichiro, Kamoto Toshiyuki, Sawada Atsuro
Аннотация
INTRODUCTION: Primary renal vein leiomyosarcoma is an extremely rare disease and the tumor often infiltrates the vessel wall. We report a case of primary renal vein leiomyosarcoma that enlarged while preserving the structure of the renal vein lumen.
CASE PRESENTATION: A 64-year-old woman underwent a computed tomography scan, which revealed a left renal hilar mass. Extra-gastrointestinal stromal tumor, leiomyosarcoma, and inflammatory myofibroblastic tumor remained in the differential diagnoses based on blood, urine, and imaging test findings. The tumor, left renal vein, kidney, and adrenal gland were resected. Hematoxylin-eosin staining revealed a tumor arising from the renal vein wall and proliferating outward beyond the vessel. The diagnosis was primary renal vein leiomyosarcoma.
CONCLUSION: When a well-defined solid tumor adjacent to the renal vein is identified, leiomyosarcoma should be considered in the differential diagnosis, and complete resection of the tumor should be pursued.
CASE PRESENTATION: A 64-year-old woman underwent a computed tomography scan, which revealed a left renal hilar mass. Extra-gastrointestinal stromal tumor, leiomyosarcoma, and inflammatory myofibroblastic tumor remained in the differential diagnoses based on blood, urine, and imaging test findings. The tumor, left renal vein, kidney, and adrenal gland were resected. Hematoxylin-eosin staining revealed a tumor arising from the renal vein wall and proliferating outward beyond the vessel. The diagnosis was primary renal vein leiomyosarcoma.
CONCLUSION: When a well-defined solid tumor adjacent to the renal vein is identified, leiomyosarcoma should be considered in the differential diagnosis, and complete resection of the tumor should be pursued.