Fig. 3. Some side-to-side flattening of the fetal head or dolichocephaly is noted. However, the cephalic index is only slightly below 1 SD from the mean. In the presence of severe dolichocephaly the head circumference should be substituted for the BPD. (Sabbagha RE: Intrauterine growth retardation. In Sabbagha RE [ed]: Diagnostic Ultrasound Applied to Obstetrics and Gynecology, 2nd ed, p 118. Philadelphia, JB Lippincott, 1987)