What is the pathophysiology of paramedian thalamic infarction in posterior cerebral artery (PCA) stroke?

Updated: Jul 30, 2018
  • Author: Erek K Helseth, MD; Chief Editor: Helmi L Lutsep, MD  more...
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This syndrome results from bilateral medial thalamic infarction. The presentation in these patients varies from lethargic to obtunded to comatose, but some patients may be agitated and may have associated hemiplegia or hemisensory loss. Occasionally, the cranial nerve III nucleus is involved, with resultant ophthalmoplegia.

Patients may take days to weeks to recover and seem to be in a sleeplike state. Although alertness generally returns, prognosis for good functional recovery is poor because of severe memory dysfunction.

The syndrome may result from a “top of the basilar” artery embolus. The artery of Percheron may be involved.

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