Membranous obstruction of Magendie's foramen
The pediatric patient presented with a severe headache and intracranial hypertension symptoms.
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MR demonstrates marked dilatation of fourth, third and lateral ventricles, without trans-ependymal edema. Midsagittal thin slices T2DRIVE images show membranous occlusion at the level of the foramen of Magendie.
Non-communicating hydrocephalus due to membranous obstruction of Magendie's foramen is a rare condition. In this case, the patient has a history of bacterial meningitis a few years ago and probable cause of membranous occlusion is a sequela of arachnoiditis.