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Occult acute fractures. Rib fracture. a, b Longitudinal (a) and axial b oblique sonograms obtained over the ninth rib. In a, US depicts a focal interruption (black arrow) of the external cortex of the rib compatible with a minimally displaced fracture. Note thickening of the periosteum (callipers) and swelling of the local soft tissues (black arrowheads). In b, early callus formation appears as a small hyperechoic area (white arrowhead)
