**2.3. Prognostic**

CCAM is not associated with syndromes, the risk of chromosomal anomalies being extremely low. In the absence of hydrops, the long-term outcome of the fetuses with CCAM is good. The incidence of hydrops is 10% in cases of a large cystic mass [12]. Termination of pregnancy before 24-week gestation remains an option for the couple. In cases of prenatal diagnosis of CCAM, the parents should be counseled about the good prognosis even though the CCAM could need a surgical postnatal resection.

The most important factor for prognosis is the presence of hydrops, which is the most important predictor of poor prognosis. If hydrops is present, the chances of survival are very low, perinatal demise being the most frequent outcome, around 100%.

Another prognostic factor has been established with the use of 3D ultrasound, in determining the CAM volume ratio, (CVR) [13]. This parameter is calculated by dividing the volume of CCAM by the HC (head circumference). That is diameter (L × AP × T) × 0.52 divided by the HC. If CVR is more than 1.6 the incidence of hydrops is 75%.
