Camptodactyly-arthropathy-coxa-vara-pericarditis (CACP) syndrome is a rare, genetic, rheumatologic disease characterized by congenital or early-onset camptodactyly and symmetrical, polyarticular, non-inflammatory, large joint arthropathy with synovial hyperplasia, as well as progressive coxa vara deformity and, occasionally, non-inflammatory pericarditis.