[Urothorax caused by traumatic rupture of the subpyelic ureter. Apropos of a case in a 5-year-old].

The authors report the observation of a five years old boy who presents after a polytraumatism a chronic pleural effusion who stop only after decortication and which is caused by a ruptur of sub-pyelic uretere. Echography is a good procedure for diagnosis. Laboratory studies of pleural fluid (protein, urea nitrogen, creatinine) could give information for diagnosis.