Six cases with chronic inflammatory hyperostotic and sclerotic changes of the clavicle are reported. No causative organisms could be detected. Four patients had involvement of other bones including the thoracic spine, the femur, the tibia and the sternal end of the other clavicle. These may be classified as having "chronic recurrent multifocal osteomyelitis" (CRMO). The remaining two patients with similar clavicular changes might have an, as yet, unifocal CRMO.