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Fig. 1A. —42-year-old woman with osteoid osteoma of distal humerus. Sagittal sonogram of posterior humerus shows cortical irregularity (between solid straight arrows) at site of osteoid osteoma with adjacent focal hypoechoic synovitis (curved arrow). Also note cortical discontinuity with posterior acoustic enhancement (arrowheads) at the site of apparent hypoechoic osteoid osteoma nidus (open arrow).