title: Anaerobic abscess of a popliteal cyst in a patient with rheumatoid arthritis.
mesh_terms: D000038:Abscess / Q000209:etiology*; D001170:Arthritis, Infectious / Q000209:etiology*; D001172:Arthritis, Rheumatoid / Q000150:complications*; D001442:Bacteroides Infections / Q000209:etiology*; D005260:Female; D006801:Humans; D007719:Knee Joint; D008875:Middle Aged; D013581:Synovial Cyst / Q000150:complications*