Paravertebral ossification in psoriatic arthritis.

* Paper read to the Heberden Society on April 3, 1965. multiple joint pains, responding only to large doses of salicylate and temporarily only to phenylbutazone. Spa treatment at Droitwich and Bath was helpful. After gold treatment he developed a rash on the legs which was treated with British anti-lewisite and cortisone, and showed improvement from May to November, 1955, after which his condition again deteriorated. In December, 1955, corticosteroid medication was increased to 20 mg. prednisone per day. He returned to work, but a further relapse occurred in October, 1956. In February, 1957, he developed skin lesions on the soles and toes-spreading to the groin, scalp, and fingers; he became depressed and developed a constant lumbar ache. There was no relevant family history or previous illnesses (apart from malaria and appendectomy). Examination.-There was daily fever up to 100-40 F. maximum while on 40 mg. prednisone, but this was controlled by adding salicylate (4 g./day) (see Fig. 1).