Palmoplantar pustulosis and severe acne are sometimes associated with aseptic skeletal lesions, but such skeletal conditions can be observed without skin lesions. The acronym SAPHO (Synovitis, Acne, Palmoplantar pustulosis, Hyperostosis, Osteitis) has been suggested for this cluster of manifestations. The most frequent site of the disease is the upper anterior chest wall, characterized by predominantly osteosclerotic lesions, hyperostosis, and arthritis of the adjacent joints. Osteosclerosis of the vertebral bodies, hyperostosis, and erosions of the vertebral plates can be encountered. Unilateral sacroiliitis of frequently observed. Long bone involvement consists of osteosclerosis or osteolysis with periosteal new bone formation. Peripheral arthritis is rarely associated with joint destruction. The pathogenesis of this syndrome remains unknown, but a link with seronegative spondylarthropathies is probable. Awareness of the SAPHO syndrome should facilitate proper diagnosis and treatment.
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