Daughter cyst sign in liver hydatid cyst.

Daughter cyst sign is one of the most characteristic imaging findings of liver hydatid cysts. It is schematically divided into two types according to the daughter cyst localization in regard to the hydatid cyst wall: endogenous daughter cysts and exogenous daughter cysts. The endogenous daughter cyst is presented by a small cyst that protrudes into the lumen of the cystic mass. The exogenous daughter cysts are enclosed in the laminated layer then gradually pushed outwards giving the hydatid a bumpy appearance that distorts the classic circular radiological image. Imaging findings could detect these daughter cysts and dictate some additional precautions during surgical procedures. This surgery is associated with a high recurrence rate essentially in case of exogenous daughter cysts. However, if we detect many exogenous daughter cysts, a radical treatment should be favored otherwise the post-operative recurrence will be certain.