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Intraventricular epidermoid. A 46-year-old male patient presented with features of raised intracranial pressure. T2W sagittal image (A) shows obstructive hydrocephalus. The fourth ventricle is undilated. A CSF-intensity lesion is seen in the posterior third ventricle (white arrow); it is not distinguishable from the surrounding ventricle. CISS axial image (B) shows an intraventricular epidermoid in the posterior third ventricle (white arrow) and better delineates the margins
