Abstract: Objective To explore the clinical features, pathogenesis and treatment methods of spontaneous obstructive urinary extravasation. Methods Retrospective analysis of 28 cases of obstructive spontaneous urinary extravasation from 2008 to 2012, summarize clinical manifestations, imaging features, explore the diagnosis and treatment of obstructive spontaneous urinary extravasation. Results All 28 patients had no significant injury history and history of acuteness activity, including 13 males and 15 females, aged 20~82 years old, average 57.6 years. Clinical manifestations include: lumbar pain 26 cases (92.9%), 18 cases (64.3%) had fever, 11 cases (39.3%) had nausea or vomiting, 10 cases (35.7%) had urinary irritation symptoms, 8 cases (28.6%) with macroscopic haematuria, 5 cases (17.9%) with abdominal distention. 22 cases (78.6%) routine blood leukocyte and neutral grain ratio increases.CTU performance with hydronephrosis, perirenal fluid.Etiology diagnosis, including 10 cases (35.7%) for ureteral calculi; 8 cases (28.6%) for ureteral tumor; 4 cases (14.3%) for ureteral tumor; Other rare causes of 6 cases (21.4%). Conclusions According to the clinical manifestations such as fever, lumbago, combined with ultrasonic and CT can help diagnosis. Find out the cause of urinary extravasation, then treat the primary disease, obstruction should be settled as soon as possible.

Key words: Urinary tract obstruction, Spontaneous urinary extravasation, CT urography