The caliper points are placed on the outer edge of the skull bone on one side and the inner edge of the skull on the opposite side. Conversely, an excessively large head circumference might suggest hydrocephalus, ventriculomegaly, or conditions associated with macrosomia.
Understanding High HC Head Circumference and Hydrocephaly Concerns
Biometric Parameter Primary Indicator Head Circumference (HC) Brain growth and neurological development Abdominal Circumference (AC) Liver size and nutritional status Femur Length (FL) Long bone growth and skeletal maturity Common Conditions Associated with Abnormal HC Abnormal head circumference measurements can be associated with a range of conditions. Accurate head circumference assessment helps clinicians identify potential anomalies or growth restrictions early in gestation, allowing for timely intervention and management.
Measurements below the 10th percentile may indicate intrauterine growth restriction, while those above the 90th percentile may suggest overgrowth or hydrocephalus. Disproportion between head size and abdominal size can indicate asymmetrical growth restriction, often linked to placental insufficiency.
High HC Head Circumference Hydrocephaly Concerns
Standardized Imaging Criteria Fetal head in a transverse position Visualization of the thalami and CSP in the same plane Calipers placed on the outer and inner tables of the skull Ensuring the image is magnified appropriately for precision Interpreting HC Percentiles Once the head circumference is measured, it is plotted on a gestational age-specific percentile chart. A head size that is significantly smaller than expected may indicate chromosomal abnormalities, genetic syndromes, or congenital infections.
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