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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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©2013 UpToDate ® Print Email Arachnoid cyst at 26 postmenstrual weeks Panel A, axial section showing the sonolucent defect (arrow), which does not communicate with the ventricles. Panels B and C are transvaginal scans. Panel B is a coronal section showing the cyst (arrow), which pushes the brain parenchyma to one side. However, there is no hydrocephaly. Panel C, more precisely shows the location of the cyst, which is in the quadrigeminal cistern, just inferior and posterior to the corpus callosum. No hydrocephaly is evident. Courtesy of Ana Monteagudo, MD.