Question:

The differential diagnosis of PSC include all of the following except :
1. Pigmented villonodular synovitis.
2. Rheumatoid or other seronegative arthritis.
3. Osteosarcoma.
4. Synovial hemangioma.
5. Synovial chondrosarcoma.





Answer:

The correct answer for the question "The differential diagnosis of PSC include all of the following except :" is:

3. Osteosarcoma.



Explanation
Osteosarcoma is associated with bone destruction and periosteal reaction associated with a soft tissue mass.



From the manuscript:
Primary synovial osteochondromatosis of the surapatellar pouch of knee. Correlation of imaging features with surgical findings
Radiology Case. 2010 Aug; 4(8):7-14


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From the manuscript

Primary synovial osteochondromatosis of the surapatellar pouch of knee. Correlation of imaging features with surgical findings

Free full text article: Primary synovial osteochondromatosis of the surapatellar pouch of knee. Correlation of imaging features with surgical findings

Abstract
A 31 years old female presented with swelling and pain above the right knee for three years. On examination, there was a tender swelling over the right knee more pronounced over the suprapatellar region. Plain X-ray, US, CT scan and MRI of the knee were suggestive of Primary synovial osteochondromatosis (PSC) of the suprapatellar pouch. Patient underwent total synovectomy and the diagnosis of synovial osteochondromatosis was confirmed histopathologically. Recognizing the imaging appearances of PSC is important to improve patient management.






References



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