Infant with a pain and swelling over the left clavicle Pediatric Imaging Musculoskeletal March 16, 2022March 30, 2022 CXR AP shows marked periosteal reaction involving the left clavicle which is thickened and hyperostotic in appearance. The right clavicle is normal. The diagnosis was infantile cortical hyperostosis. Related Published March 16, 2022March 30, 2022