A Case of Psoriatic Arthritis with Elbow Involvement Misdiagnosed as Osteomyelitis

Psoriatic arthritis is a chronic systemic inflammatory disease characterized by joint inflammation associated with psoriasis and may present with a variety of clinical manifestations related to bone structures and soft tissues around the joints. Psoriatic arthritis may show radiological findings similar to osteomyelitis (OM). A 69-year-old patient who had been diagnosed with psoriatic arthritis for 5 years was referred to our clinic with a preliminary diagnosis of OM due to severe pain in the right elbow. The patient had polyarthralgia and extensive skin involvement. Disease activation was considered as a result of detailed investigations. Both the joint and skin involvement of the patient was controlled with biological agent treatment. Differential diagnosis should be done carefully in patients with arthralgia and/or arthritis. Advanced radiological imaging should be performed.