[Urachal cyst: contribution of ultrasound (about a case at Sourou Sanou Sobo-Dioulasso university hospital)].

Urachal cyst is difficult to diagnose and is a rare malformation and the authors report a case in a 10-month old boy. The malformation was associated with posterior urethral valve and simple surgical treatment was successful. The authors emphasize the contribution of perineal ultrasound in the diagnosis of associated posterior urethral valves.