Differentiating point between psoriatic and rheumatoid ahritis are the following except: (A) Pencil-in-cup deformity, (B) Telescoping of phalanges, (C) Mael's sign, (D) Tufting of phalanges
Answer is C. Mael's sign is the overhanging edge sign of tophaceous gout. Ref - Radiologyassistant.org