Preschooler with a limp Pediatric Imaging Musculoskeletal February 27, 2022March 30, 2022 AP radiograph of the ankle shows a metadiaphyseal lesion that is lytic and within the cortex with a narrow zone of transition and a sclerotic rim and no periosteal reaction. The diagnosis was fibrous cortical defect. Related Published February 27, 2022March 30, 2022