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NORMAL CONVEX CONTOUR
OF THE FETAL CRANIUM
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- Ovoid and symmetrical.
- Slight flattening of the forehead.
- Slight convex bilateral bulging of the parietal eminences.
- Brighter and thicker than the falx on the trans-axial view.
- Continuity of the calvarium.
- Assessment
of the orbits
- Size, shape and interorbital distance.
- Abnormalities of the orbits may be the first clue that other cranial anomalies exist.
- Moulding and overlap of the cranium sutures may occur in:
- Severe oligohydramnios.
- Premature rupture of membranes.
- Extrinsic transducer pressure.
- It is important to demonstrate normal cranial ossification (this differentiates this from osteogenesis imperfecta).
