Smooth Muscle Tumor of Uncertain Malignant Potential Arising from Renal Vein

Smooth muscle tumors (SMTs) typically fall under either benign leiomyoma or malignant leiomyosarcomas based on histologic characteristics. SMTs that cannot be diagnosed as are then labeled smooth of uncertain potential (STUMP). A 31-year-old male presented with the right abdominal pain for 6 months. Imaging showed an enhancing soft-tissue mass arising from renal vein. pre-operative biopsy confirmed STUMP vein, and patient underwent surgical resection partial nephrectomy. pathologic findings play a crucial role in accurate pre-procedural diagnosis unusual SMTs.