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Click
on image(s) to view JPEG image(s).
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Patient
4
51-year-old male with surgically proven PVNS of right knee.
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| 1. |
Sagittal
T1W MR image reveals nodular, lobulated intermediate signal
intensity mass. It is uncommon for sarcomas to be intraarticular
in location. Rarely synovial sarcomas may arise in intraarticular
locations.
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| 2. |
Sagittal
contrast enhanced T1W MR image reveals nodular low signal
intensity foci within mass with areas of enhancement around
individual nodules.
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| 3. |
Coronal
T2W MR image reveals nodular high signal intensity focus.
PVNS does not have to exhibit low signal intensity on T2W
MR images to suggest this diagnosis.
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| 4. |
Photograph
of the gross resected specimen superimposed on the sagittal
MR image reveals the nodularity within the mass corresponding
to the MR image.
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| 5. |
Photomicrograph
(original magnification, X120, H-E stain) reveals the synovial
villous proliferation and interspersed hemosiderin pigment
characteristic of PVNS. Presence or absence of low signal
intensity on T2W MR images may depend on histologic composition,
stage of hemorrhage and amount of hemosiderin.
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