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Marker of skeletal dysplasia by two-dimensional ultrasound. A: Abnormal angulated femur; B: Osteogenesis imperfecta: cranial vault distortion upon probe pressure. (Adapted from Cassart[98]); C: Features of thanatophoric dysplasia: depressed nasal bridge (arrowhead), prominent forehead (double arrows), and undersized thorax (single arrow) compared with the abdomen. Adapted from Dighe et al[99].
