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Updated: Apr 3, 2026
Knee Arthrocentesis in Adults
Published on: February 25, 2022
Pyogenic Baker cyst in a patient with psoriatic arthritis during etanercept therapy
Keng-Yi Wu, Deng-Ho Yang1, Chun-Wen Chen
1Deng-Ho Yang, MD, Division of Rheumatology/Immunology/Allergy,, Taichung Armed-Forces General Hospital,, No 348, Sec. 2, Chung Shan Road,, Taiping 411, Taichung, Taiwan,, Republic of China, T: +886-4-23934192, F: +886-4-23934191, deng6263@ms71.hinet.net.
Abstract:
Patients with psoriatic arthritis (PsA) are at increased risk of infection due to disease course or treatment-related immunodeficiency. We describe a patient with a 10-year history of PsA, with arthritis of the right knee and pain and edema in the right calf, treated with the TNFa inhibitor etanercept for 6 months. Ultrasound showed accumulation of hypoechoic fluid, which was aspirated and was positive for staphylococcus and aspergillus. The patient recovered after surgical drainage and four weeks of antibiotic and antifungal therapy.
