Imaging Upper Extremity Injuries in Pediatric Athletes SA–CME REVIEW Figure 9. Olecranon apophysitis in a 10-year-old gymnast. (A) Lateral radiograph of right elbow shows subtle widening of the posterior physis (arrow). (B) Sagittal T2 MR image confirms the physeal widening (arrow) and shows associated edema in the apophysis (star). A B Figure 10. Fishtail deformity in a 15-year-old baseball pitcher who presented with elbow pain and limited flexion. (A) AP radiograph shows a fishtail deformity with a concave defect in the distal humerus (arrow) and elongated and tapered lateral trochlea. There is mild radial subluxation. (B) Coronal fat-suppressed T2 image confirms an elongated lateral trochlea (arrow) and concave defect of the medial trochlea (star) with associated lateral migration of the ulna, resulting in lateral subluxation of the radial head (curved arrow). A B Applied Radiology 12 March / April 2022