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Mesencephalic developmental venous anomaly causing obstructive hydrocephalus: illustrative case

Kota Hiraga, Shigemasa Hayashi, Ryosuke Oshima, Tatsuma Kondo, Fumiaki Kanamori, and Ryuta Saito

axial T1-weighted MR image showing that the bilateral temporal horns and third ventricle are dilated. The Evans index is 0.44. B: Preoperative sagittal T1-weighted contrast-enhanced MR image. The DVA directly above the cerebral aqueduct is observed as the abnormal distended linear region with enhancement ( yellow arrow ). The fourth ventricle is not dilated. An enhancing structure within the frontal horn is aliasing. C: Preoperative digital subtraction angiography shows a mesencephalic DVA ( red arrow ). The patient underwent endoscopic third ventriculostomy