Aqueduct stenosis due to a web
Enlarged head size in a child with a history of birth asphyxia.
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The MRI sequences demonstrate a dilatation of the 3rd and lateral ventricles with normal size and configuration of the 4th ventricle. There is an aqueduct stenosis (web or diaphragm) seen on the sagittal Fiesta.
Aqueductal stenosis is considered as the most common cause of congenital obstructive hydrocephalus, It can also be seen in adults as an acquired abnormality.
Additional contributor: R. Bouguelaa, MD