Atrial diverticula in severe hydrocephalus

T. P. Naidich, D. G. McLone, Y. S. Hahn, J. Hanaway

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Massive ventricular dilatation causes stretching and dehiscence of the fornix with formation of unilateral or bilateral pial pulsion diverticula of the inferior medial wall of the atrium. Enlargement of the pial pouch creates a dramatic subarachnoid cyst that may herniate downward through the incisura into the lateral mesencephalic, precentral cerebellar, and superior vermian cisterns where it displaces the brain stem, vermis, and fourth ventricle. Lateral ventricular diverticula may be identified and distinguished from the dilated fourth ventricle and dilated suprapineal recess, with which they are so commonly confused, when all of the following signs are apparent on computed tomography (CT): marked unilateral or bilateral atrial dilatation; focal dehiscence of the medial atrial wall; ipsilateral shortening of the tentorial band in axial section; focal defect in the tentorial band in coronal section; draping of the medial atrial wall over the free margin of tentorium, with continuity of cerebrospinal fluid density around the edge of tentorium in axial and/or coronal sections; bowing of the crus (or crura) of fornix; separation of fornix from splenium, with visualization of the hernia ostium; asymmetrical position of the choroid plexi, which attach to and define the lateral borders of the fornices; contralateral displacement of the internal cerebral veins; and septa separating diverticulum from third ventricle.

Original languageEnglish (US)
Pages (from-to)257-266
Number of pages10
JournalAmerican Journal of Neuroradiology
Issue number3
StatePublished - 1982

ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging


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