When stratified by gender, male fetuses characteristically have higher frequency of isolated MCM compared to female fetuses and the mean measurements of the cisterna magna appear to be larger for males8.
Isolated MCM###Slightly prominent cisterna magna###Mega cisterna magna with
Clinical significance of isolated mega cisterna magna is not clear and most of the studies have reported a good prognosis.3,6
Clinical significance of isolated enlargement of the cisterna magna on prenatal sonography.
Enlarged cisterna magna and the Dandy-Walker malformation: factors associated with chromosome abnormalities.
The distances from the skin to the posterior wall of cisterna magna are summarized in [Table 3].
The best correlation was found between the distance from the skin to the cisterna magna and gender according to the standardized coefficients.{Table 4}
The cisterna magna occupies a large space in the brain where CSF can be collected, or medication administered for intrathecal infusion; [sup][1],[2] however, the distance from skin to the cistern and depth of cisterna magna varies by gender, weight and age.
In this study, significant gender differences were seen in the distance from the skin to cisterna magna, this result is similar to Zhao et al .'s results.
Serious complications such as laceration of the cerebellar artery by sub-occipital puncture of the cisterna magna, may ensue if the direction of the needle is inappropriate.
Cystic posterior fossa malformations - Dandy Walker malformation, Dandy Walker variant, mega cisterna magna, Blake's pouch cyst, arachnoid cyst.
Mega cistern Magna: Mega cisterna magna represents the mildest end of Dandy Walker spectrum.
