rheumatic disorder isolated sternocostoclavicular hyperostosis https://www.malacards.org/card/isolated_sternocostoclavicular_hyperostosis Orphanet:178311 SCTID:766711009 MEDGEN:1640582 isolated SCCH UMLS:C4707796 GARD:0020144 MONDO:0044355 Isolated sternocostoclavicular hyperostosis is a rare rheumatologic disease characterized by predominantly bilateral, chronic, sterile inflammation and progressive sclerosis and hyperostosis of the sternocostoclavicular joint, with adjacent soft tissue ossification, in the absence of other joint involvement. It presents as recurrent episodes of pain, edema and/or erythema of the sternoclavicular region. Palmoplantar pustulosis may be additionally observed in some cases.