الفهرس 
ANATOMY OF THE CERVIXOnly 14 pages are availabe for public view
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Abstract
Cervical incompetence seriously affects pregnancy outcome. It is considered responsible for 16-20% of second trimester abortions and up to 250/0 of pretenn labour. Diagnosis of cervical incompetence is based primarily on obstetrical history and physical examination. However, in many cases the history is suspicious or poor and examination depends on the examiner’s experience. This study was divided into 2 parts: Part one of the study, nomogram establishment of cervical dimensions, 404 patients were studied, 204 pregnant cases with no risk factors for incompetent cervix were evaluated by TVS from 10th week to 38th week of pregnancy, 100 high risk pregnant cases for incompetent cervix evaluated by TVS before and after cerclage, also, 100 non-pregnant cases evaluated by TVS. By discriminant analysis ofnonnal pregnant and high risk pregnant cases, our sonographic criteria for incompetent cervix: cervical length less than 25 mm, intemal os diameter more than 6 mm, and obtuse posterior cervical angle, at least 2 of 3 parameters must be present for cerclage to be adopted, also the normal predictive value 88.9% and risk predictive value 86.4%.