Image of the Week: Worsening arthralgia in a patient with psoriasis

A 70-year-old woman with psoriasis presents with a 4-month history of worsening arthralgia. She mentions she has pain and stiffness in her big toes and most of her fingers. On examination, a telescoping finger deformity is seen on her right second digit. What proportion of patients with psoriasis may develop accompanying arthritis? Learn more about this case, take ...