Sagittal T1-weighted magnetic resonance imaging (MRI) showing aqueductal stenosis due to a tectal lesion. There is dilation of the third ventricle (arrow), while the size of the fourth ventricle (thick arrow) remains relatively normal. The hydrocephalus was treated with a third ventriculostomy.
Courtesy of Drs. Abilash Haridas and Tadanori Tomita.
Graphic 78793 Version 3.0
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