At 32 weeks pregnancy my baby developed mild ventriculomegaly & mega cisterna magna. torch is good except it is + for cmv igg and - for igm any conect?

No : The CMV igg indicates a past infection and the negative igm indicates no recent infection or exposure. This combination makes CMV an unlikely cause. Mild ventriculomegaly often is simply monitored by serial ultrasounds.

Venriculomegaly: Mild ventriculomegaly and a large cisterna magna can all be within a normal range - the OB will need to follow the growth of the head with ultrasound and if the head growth takes off then sometimes the child will be delivered early though that is unusual.