title: Tuberculous arthritis of the knee joint mimicking pigmented villonodular synovitis.
abstract: Tuberculous arthritis is difficult to diagnose early because of its atypical insidious clinical manifestations and non-specific imaging findings. Specifically, monoarticular tuberculosis of the knee may mimic pigmented villonodular synovitis (PVNS). The present report describes a young patient with tuberculous arthritis of the knee. Proper diagnosis was delayed due to magnetic resonance imaging findings, such as hemosiderin deposits and a nodular mass around the knee joint, suggesting the diffuse type of PVNS. These findings suggest that the first step in the diagnosis of tuberculous knee arthritis is to have a high index of suspicion.
  
  
  METHODS
  IV.
authors.affiliation: Department of Orthopaedic Surgery, Korea University Anam Hospital, Korea University College of Medicine, 126-1, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-705, Korea. eoak22@empal.com
authors.forename: Dae-Hee
authors.initials: DH
authors.lastname: Lee
authors.forename: Dong-Ki
authors.initials: DK
authors.lastname: Lee
authors.forename: Soon-Hyuck
authors.initials: SH
authors.lastname: Lee
authors.forename: Jong-Hoon
authors.initials: JH
authors.lastname: Park
authors.forename: Chul-Hwan
authors.initials: CH
authors.lastname: Kim
authors.forename: Seung-Beom
authors.initials: SB
authors.lastname: Han
mesh_terms: D001168:Arthritis / Q000382:microbiology / Q000473:pathology*; D001182:Arthroscopy; D003937:Diagnosis, Differential; D006801:Humans; D007719:Knee Joint / Q000382:microbiology / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D013586:Synovitis, Pigmented Villonodular / Q000473:pathology*; D014376:Tuberculosis; D014394:Tuberculosis, Osteoarticular / Q000175:diagnosis / Q000473:pathology*; D055815:Young Adult