Hyperostosis and multifocal osteitis: a purely rheumatological subset of the SAPHO syndrome.

SAPHO has recently been proposed as an acronym to identify a syndrome characterized by synovitis, acne, pustulosis, hyperostosis and osteomyelitis. Several authors have, however, found that this rare condition may even occur without cutaneous manifestations. The work reported here presents the case of a 43-year-old male with skeletal involvement alone. An in-depth study of the patient revealed the arthro-osteitic pattern typical of the SAPHO syndrome. In agreement with previous reports, these data confirm that the present clinical picture of hyperostosis and osteitis, even without cutaneous involvement, is nonetheless related to the SAPHO syndrome.