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 Volume 65, Number 1, July 12, 2005
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NEUROLOGY 2005;65:135-137
© 2005 American Academy of Neurology
Brief Communications

Pseudo-subarachnoid hemorrhage: A CT-finding in spontaneous intracranial hypotension

Wouter I. Schievink, MD, M. Marcel Maya, MD, James Tourje, MD and Franklin G. Moser, MD

From the Maxine Dunitz Neurosurgical Institute (Dr. Schievink) and Imaging Medical Group (Drs. Maya, Tourje, and Moser), Cedars-Sinai Medical Center, Los Angeles, CA.

Address correspondence and reprint requests to Dr. Wouter I. Schievink, Maxine Dunitz Neurosurgical Institute, Cedars-Sinai Medical Center, 8631 West Third Street, Suite 800E, Los Angeles, CA 90048; e-mail: schievinkw{at}cshs.org

Increased attenuation in the basilar cisterns or along the tentorium cerebelli resembling subarachnoid hemorrhage (SAH) may be found on CT in the absence of blood (pseudo-SAH). The authors found pseudo-SAH on CT in four of 40 patients with spontaneous intracranial hypotension. All four patients had brain sagging with obliteration of the cisterns and pachymeningeal enhancement along the tentorium cerebelli. Spontaneous intracranial hypotension should be included in the differential diagnosis of pseudo-SAH.

Received January 27, 2005. Accepted in final form March 28, 2005.




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