We herein report 10 patients with spontaneous peripelvic extravasation. They were 7 males and 3 females, ranging in age from 39 to 78 years old. The spontaneous peripelvic extravasation were caused by ureteral stones in 6 patients, and by invasion of malignant tumors in 4 patients (2 gastric cancer, 1 prostatic cancer, 1 uterine cancer). In all patients with ureteral stones, the extravasation disappeared following conservative therapy or double J stent placement. In the cases of malignant tumors, nephrostomy or double J stent placement were needed for treatment of the extravasation and their prognosis were very poor.
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