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What is This lesion are most commonly seen in which disease? and explain in detail?
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. Sacroiliitis/spondylitis (40%)c. Symmetrical seronegative arthritis (15%)d. Distal interphalangeal joint arthritis (15%)Arthritis mutilans. On X-ray pencil in cup appearance is seen.Hand Joints involved in Psoriasis = PIP+DIP+MCP+ Wrist