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[Pigmented villonodular synovitis].

W Holzmüller, K Bohndorf, J M Müller

Der Chirurg; Zeitschrift Fur Alle Gebiete Der Operativen Medizen

|August 1, 1986

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A rare knee condition, pigmented villo-nodular synovitis, caused recurrent swelling and limited motion in a young woman. Surgical removal was successful, but close follow-up is crucial due to its high recurrence rate.

Area of Science:

Orthopedics
Pathology
Medical Imaging

Background:

Pigmented villo-nodular synovitis (PVNS) is a rare, benign neoplastic proliferation of the synovium.
It typically affects large joints, commonly the knee, presenting with swelling, pain, and limited range of motion.
Initial presentations can mimic malignant tumors, necessitating thorough diagnostic evaluation.

Observation:

A 31-year-old female presented with 8 years of recurrent right knee swelling.
Despite minimal pain, severe limitation of knee flexion was noted.
Initial investigations raised suspicion for a malignant neoplasm due to the extensive swelling.

Findings:

Knee joint biopsy confirmed the diagnosis of pigmented villo-nodular synovitis.
The patient underwent synovectomy (surgical removal of the synovial lining).

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The postoperative course was uneventful, with no immediate complications.

Implications:

Pigmented villo-nodular synovitis, though benign, has a significant recurrence rate of 33%.
Close long-term follow-up is essential after surgical management to monitor for potential regrowth.
Accurate diagnosis is critical to differentiate PVNS from aggressive malignancies, guiding appropriate treatment strategies.