Question

Identify the condition shown in the CT Scan image below.

• A. Dandy walker malformation
• B. Cerebellar vermis hypoplasia
• C. Mega cisterna magna
• D. None

Answer 1

The Correct Option is A

The CT scan image depicted is indicative of a condition known as Dandy-Walker malformation. This congenital brain malformation involves the cerebellum, an area of the brain that controls movement and posture. Key features of Dandy-Walker malformation observable in imaging include:

• Partial or complete absence (agenesis) of the cerebellar vermis, the part of the brain between the two cerebellar hemispheres.
• A dilation of the fourth ventricle, appearing as an enlarged space at the base of the skull.
• An enlargement of the posterior fossa, which is the internal base of the skull where the cerebellum is located.

This condition is differentiated from other similar conditions such as cerebellar vermis hypoplasia, which involves incomplete development of the cerebellar vermis, and mega cisterna magna, which is characterized by an enlarged cisterna magna but with an intact cerebellum and fourth ventricle. Given these specific radiological features, the correct diagnosis from the CT scan image is Dandy-Walker malformation.