الفهرس 
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Abstract
In this thesis foetal head biometric measurements (BPD, HC and OFD) were discussed in details regarding definitions, different measuring methods and their importance in obstetric practice. Other foetal biometric ultrasound scanning as gestational sac diameter, crown rump length, abdominal circumference, femur length and less frequently used parameters as foetal thoracic diameter, thoracic circumference, measurement of long bones, orbit and lens dimension were reviewed.
The aim of this work was to compare ultrasound measurement of biparietal diameter, head circumference and occipitofrontal diameter in cases of vertex versus breech presentations between 20 to 40 gestational weeks of normal pregnancy. The study included 700 vertex and 700 breech presentation with a mean age of the studied population in breech group was 26.6 years ranging from 18 to 45 years while the mean age of the studied population in cephalic group was 27 years ranging from 18 to 42 years.
The mean gravidity was around 2.2 ranging from 1 to 8 , the parity ranged from 0 to 6 with a mean of 0.99. The mean gravidity was around 2.4 ranging from 1 to 7, the parity ranged from 0 to 6 with a mean of about 1.1 in cephalic sample
The biparietal diameter of vertex presentation showed no difference with those of breech presentation. There was no difference between head circumference and occipitofrontal diameter of vertex presented fetuses and those of breech presentation. As there were no significant difference between both groups we can recommend the use of fetal head biometric tables established for cephalic presentation to assess date and growth of fetus in breech presentation.