Case Of the Week (COW) 19 Jan 2014
Answer:
LOCALIIZED NODULAR SYNOVITIS OF KNEE
Findings:
Well defined ovoid lesion noted in the intercondylar fossa ,posterior to posterior cruciate ligament. Few foci of intemixed low signal intensity , reflectinng Hemosiderin deposition is noted . The lesion is Iso /hyperintense in TIWI and Variable signal in T2W1
Discussion:
Localized nodular synovitis, (synovial giant cell tumor) is a benign lesion characterized by localized synovial proliferation. Knee is an unusual site for this lesion , common sites being joints of fingers and toes . The most common sites in knee are Infrapatellar fat pad and Supapatellar pouch. The posterior intercondylar notch has been rarely reported. The absence of diffuse frond like synovial proliferations or excess hemosiderin deposition excludes Pigmented Villonodular Synovitis .
Ref: Localized Nodular Synovitis of the Knee: MR Imaging Appearance -Guo-Shu Huang et al AJR August 2003, Volume 181, Number 2
Contributed By:
Dr. Babu Peter MD, DNB
Associate Professor, Barnard Institute of Radiology
Senior Consultant Radiologist, Aarthi Scans, Chennai
Answer:
LOCALIIZED NODULAR SYNOVITIS OF KNEE
Findings:
Well defined ovoid lesion noted in the intercondylar fossa ,posterior to posterior cruciate ligament. Few foci of intemixed low signal intensity , reflectinng Hemosiderin deposition is noted . The lesion is Iso /hyperintense in TIWI and Variable signal in T2W1
Discussion:
Localized nodular synovitis, (synovial giant cell tumor) is a benign lesion characterized by localized synovial proliferation. Knee is an unusual site for this lesion , common sites being joints of fingers and toes . The most common sites in knee are Infrapatellar fat pad and Supapatellar pouch. The posterior intercondylar notch has been rarely reported. The absence of diffuse frond like synovial proliferations or excess hemosiderin deposition excludes Pigmented Villonodular Synovitis .
Ref: Localized Nodular Synovitis of the Knee: MR Imaging Appearance -Guo-Shu Huang et al AJR August 2003, Volume 181, Number 2
Contributed By:
Dr. Babu Peter MD, DNB
Associate Professor, Barnard Institute of Radiology
Senior Consultant Radiologist, Aarthi Scans, Chennai