Any cyst (usually lined with columnar or cuboidal cells) that develops from a rudimentary medullary canal in the central nervous system. ... Origin: myelo-+ G. Kystis, bladder ... (05 Mar 2000) ... 
(mi´ә-lo-sist) a cyst developed from rudimentary medullary canals.
Type: Term Pronunciation: mī′ĕ-lō-sist Definitions: 1. Any cyst (usually lined with columnar or cuboidal cells) that develops from a rudimentary central canal in the central nervous system.