Pachydermoperiostosis (primary hypertrophic osteoarthropathy)

: A case of pachydermaperiostosis in a 16 year old male is presented. The main clinical features were bilateral mechanical gonalgia, acropachy, bilateral palpebral ptosis and hyperhydrosis. The diagnosis was confirmed by X-ray, showing a wide, symmetric periostosis. The literature is reviewed and the differential diagnosis is commented on.