microcephaly antenatal ultrasound
The detection of microcephaly usually becomes easier as the gestation advances. The small head is best assessed by using the head circumference (HC). Measurement of the biparietal diameter (BPD) is not helpful in diagnosing microcephaly as the head shape can be misleading
In addition, the diagnosis should be reserved for cases where there is a significant discrepancy between the head size and the rest of the body.
