Isolated intra-articular pseudorheumatoid nodule of the knee.
The authors describe a case of an isolated intra-articular pseudorheumatoid nodule of the knee in an 18-year-old male patient without a diagnosis of rheumatoid arthritis. The patient initially presented with a 3 year history of anterior knee pain and was found to have a 2.8 × 2.1 cm lobulated soft-tissue mass. Histologic findings showed fibrinoid necrosis and chronic inflammatory changes that were consistent with those of a pseudorheumatoid or rheumatoid nodule, and surgical excision of the nodule was curative. A review of the literature revealed no prior cases of an intra-articular pseudorheumatoid nodule or rheumatoid nodule in a patient without clinical or serologic evidence of rheumatoid arthritis.
Plymale
Mickey
M
Department of Orthopaedic Surgery, Montefiore Medical Center, Albert Einstein College of Medicine, MMC Greene Medical Arts Pavilion, 3400 Bainbridge Avenue, Bronx, NY 10467, USA.
Lovy
Andrew
A
Villanueva-Siles
Esperanza
E
Geller
David S
DS
D000293:Adolescent; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D011859:Radiography; D012218:Rheumatoid Nodule / Q000000981:diagnostic imaging* / Q000473:pathology