<prompt> This lesion are most commonly seen in which disease?RAAnkylosing spondylitisPsoriatic ArthritisGout  <response>: Ans. C. Psoriatic ArthritisPsoriatic ArthritisIt is a seronegative inflammatory arthritis and associated with characteristic changes in the nails pitting and transverse ridges.Clinical Featuresa. Asymmetrical oligoarthritis 70 DIP involvement is a characteristic feature.b. Sacroiliitisspondylitis 40c. Symmetrical seronegative arthritis 15d. Distal interphalangeal joint arthritis 15Arthritis mutilans. On X-ray pencil in cup appearance is seen.Hand Joints involved in Psoriasis PIPDIPMCP Wrist 