[Osteopecilia associated with psoriatic arthritis].

Osteopecilia is a benign and rare condensing osteopathy. Its association with inflammatory rheumatism is very rare. We here report the case of a 25-year old patient with skin psoriasis, presenting with groin pain of inflammatory origin. Physical examination showed limitation of hip motions, lower limb-length inequality and pain on right sacroiliac mobilization. Laboratory tests showed inflammatory syndrome and negative immunological assessment. The radiograph of the pelvis revealed osteopecilia associated with destructive coxitis. CT scan of the pelvis showed coxitis and osteopecilia associated with bilateral sacroiliitis. The diagnosis of psoriatic arthritis associated with osteopecilia was retained. The patient was treated with methotrexate and NSAIDS. Osteopecilia usually is unexpectedly detected. Diagnostic radiology is essential to avoid unnecessary explorations and treatments.