Dramatic malignant progression of a pigmented villonodular synovitis of the knee after 27 years of multimodality treatment


Serval ID
Inproceedings: an article in a conference proceedings.
Publication sub-type
Poster: Summary – with images – on one page of the results of a researche project. The summaries of the poster must be entered in "Abstract" and not "Poster".
Dramatic malignant progression of a pigmented villonodular synovitis of the knee after 27 years of multimodality treatment
Title of the conference
73. Congrès Annuel de la Société Suisse d'Orthopédie et de Traumatologie
Cherix S., Matter M., Gay B., Becce F., Matzinger O., Letovanec I., Stanekova K., Rüdiger HA
Lausanne, Suisse, 26-28 juin 2014
Publication state
Issued date
Introduction: Pigmented villonodular synovitis (PVNS) is a rare benign tumour of the synovium, most commonly arising around the knee. Resection remains the treatment of choice. The diffuse variant of the disease is prone to local recurrence (30-50%). However distant dissemination is extremely rare. We report the case of a patient with massive loco-regional and late distant spread to the lungs of PVNS originating in the knee.
Case report: A 69 yo women presented to our service 27 years ago with PVNS in her knee. Despite multible surgical resections, synoviorthesis and external beam radiotherapy, no local control was achieved. The disease spread in all thigh compartments. Due to the resistance to all convetional treatment modalities, isolated limb perfusion with TNFα and Melphalan was performed, without any effect on local control. After the disease was diagnosed in iliac lymph nodes, the patient was subjected to a systemic chemotherapy protocol with imitamib, which had to be abandoned, due to intolerance. Due to a giant lymphoedema of the entire limb, making up for a considerable part of the patient's body weight and in view of significant skin invasion, a hip disarticulation was performed. Finally, rapidly growing lung metastases appeared on CT scan, confirmed by core-needle biopsy. Palliative chemotherapy was initiated.
Interestingly, histological analysis of the disease throughout the years remained consistent with classic benign PVNS. No sarcomatous dedifferentiation was observed, not even in the pulmonary lesions.
Conclusion: PVNS is a benign tumour, with a high risk of local recurrence. Malignant behaviour, with loco-regional and distant metastases remains extremely rare. A histologically benign appearance does not exclude a clinically malignant behaviour with systemic spread.
Create date
14/07/2014 9:57
Last modification date
20/08/2019 16:00
Usage data