incompetent cervical os

Medical Dictionary

incompetent cervical os n.
A defect in the muscular ring at the isthmus of the uterus, allowing premature dilation of the cervix during pregnancy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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