Spontaneous urinary extravasation is a rare condition; thus a case, in association with renal colic, is reported. Echography demonstrated rupture of the calycealfornix with perirenal homogenous fluid accumulation. Ureteral catheterization (Double J stent) was performed, and the patient's symptoms improved progressively. Repeat intravenous urography and echo graphy showed normally functioning kidneys and absorption of the ext ravasation. Conservative treatment for this condition is recommended except for frank rupture of the renal pelvis or ureter and formation of a perirenal abscess.