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Stress fracture. MTP sesamoids. a, b Axial (a) and sagittal (b) colour Doppler sonograms. US shows a focal break (black arrowhead) of the medial sesamoid (MS) associated with periosteal thickening (white arrowheads) and hyperaemia. The lateral sesamoid (LS) is normal. MT1 first metatarsal, FHKL flexor hallucis longus tendon
