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Pigmented villonodular synovitis: dedicated PET imaging findings.

Ian Blake Amber¹, Brian J Clark, Gary Stuart Greene

¹Department of Radiology, The Pennsylvania Hospital, University of Penn Health System, Philadelphia, Pennsylvania, USA.

BMJ Case Reports

|April 20, 2013

Summary

Recurrent pigmented villonodular synovitis (PVNS) shows high metabolic activity on PET scans, mimicking malignancy. Treatment reduces this activity, suggesting a neoplastic origin for PVNS.

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Area of Science:

Oncology
Radiology
Pathology

Background:

Pigmented villonodular synovitis (PVNS) is a rare condition causing significant joint pain.
Magnetic resonance imaging (MRI) is the standard diagnostic tool for PVNS.
Prior positron emission tomography (PET) findings in PVNS were limited and associated with malignancy.

Observation:

PET imaging is increasingly used to assess treatment response in recurrent PVNS.
Recurrent PVNS exhibits heightened metabolic activity on PET scans.
This hypermetabolism can resemble malignant or metastatic disease.

Findings:

Post-treatment PET evaluations show reduced metabolic activity in PVNS.
Decreased metabolic activity indicates a positive response to treatment.
The metabolic behavior of PVNS supports a potential neoplastic origin.

Implications:

PET imaging can help differentiate recurrent PVNS from malignancy.
Monitoring metabolic activity may guide PVNS treatment strategies.
Understanding PVNS's neoplastic potential could lead to targeted therapies.