What are the characteristic CT findings in congenital cytomegalovirus (CMV) infection of the central nervous system, and how do they differ from those in congenital toxoplasmosis?

The most common CT finding in congenital CMV infection is periventricular calcification. Unlike congenital toxoplasmosis, CMV does not typically present with calcifications in the basal ganglia or cortices. Key diagnostic features include microcephaly and ventriculomegaly. A common pitfall is confusing CMV with other TORCH infections, so attention to the pattern of calcification is crucial.