(A) Twenty-four weeks of gestation: Two-dimensional ultrasound cross-section of the thorax demonstrates the "bashed in" appearance of the ribs at the lateral aspect of the thorax due to the elbows hitting the fragile rib bones resulting in fractures and angulation (arrows). (B) Three-dimensional ultrasound sagittal image of the wavy irregular contour of the ribs due to multiple fractures. Note the ribs are short and do not encircle the thorax.
