[Congenital cystic dilatation of the common bile duct in adults. Apropos of a case diagnosed ultrasonically].

The authors report the observation of a thirty years old woman presenting a choledochal cyst demonstrated by echography. This rare condition is characterized by a segmentary dilatation of the distal portion of the commun bile duct needing surgical treatment. The described case is distinguishable from usual forms by a few own particularities.