Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Left PC PPV due to nonampullary arm canalolithiasis. Nystagmus does not reverse its direction when the patient returns into the sitting position: the lack of reversal could be due to the reduced movement of the clot in a restricted tract of the PC that, is in a roughly horizontal plane. Solid line: horizontal plane; dashed line: plane corresponding to that of nonampullary arm of PC in the sitting position.
