Acute posterior fossa syndrome following lumbar drainage for treatment of suboccipital pseudomeningocele

Report of three cases

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✓ The authors report on a series of patients who underwent lumbar drainage of cerebrospinal fluid (CSF) for treatment of posterior fossa pseudomeningoceles and who subsequently developed an acute posterior fossa syndrome. These patients were found to have similar radiological findings demonstrating acute mass effect secondary to movement of CSF from the pseudomeningocele into the cerebellar parenchyma. Discontinuation of lumbar drainage resulted in symptomatic and radiological improvement in all patients. From these cases the authors infer that not all pseudomeningoceles communicate directly with the subarachnoid space. A readily recognizable appearance on magnetic resonance imaging that is useful in diagnosing this reversible complication of treatment for posterior fossa pseudomeningocele is also illustrated.

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Contributor Notes

Address reprint requests to: William Dillon, M.D., Department of Radiology, University of California San Francisco Medical Center, San Francisco, California 94143. email: William.Dillon@radiology.ucsf.edu.

© AANS, except where prohibited by US copyright law.

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