1 MCQs in Radiology for NEET PG
A 29-year-old G2P1 woman at 20 weeks gestation presents for routine anomaly scan. Maternal serum alpha-fetoprotein is elevated at 3.8 MOM. Transabdominal ultrasound in the transventricular axial view demonstrates the fetal cranium with bilateral concavity of the frontal bones (marked **A**) giving a characteristic scalloped appearance. The transcerebellar view reveals caudal displacement of the cerebellum through the foramen magnum with loss of its normal dumbbell shape. Fetal spine imaging confirms an open lumbosacral myelomeningocele. Which of the following best describes the pathophysiologic mechanism underlying the frontal bone deformity marked **A**?
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