[in″trah-sis-ter´nal] within a subarachnoid cistern.
in·tra·cis·ter·nal
(in'tră-sis-tĕr'năl), Within one of the subarachnoid cisternae; usually refers to the introduction of a cannula into the cerebellomedullary cistern for aspiration of cerebrospinal fluid or the injection of air into the ventricles of the brain.
intracisternal
(ĭn″tră-sĭs-tĕr′năl) [″ + cisterna, cavity] Within a cistern of the brain.