Normal pressure hydrocephalus
Worsening gait and incontinence
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MRI demonstrates marked ventriculomegaly with sulci at the vertex being somewhat smaller than elsewhere. The aqueduct of Sylvius is large and demonstrates a very prominent flow void. Not that there is only minor ballooning of the third ventricle.
Features are consistent with a communicating hydrocephalus, and the prominent aqueductal flow void suggests normal pressure hydrocephalus. This is especially the case given the clinical history.