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Case Report
A rare case of extra-articular pigmented villonodular synovitis of the knee in a child
1 MD, Department of Orthopedic and Traumatology, Centro Hospitalar Lisboa Ocidental, Lisbon, Portugal
2 MD, Department of Anatomic Pathology, Centro Hospitalar Lisboa Central, Lisbon, Portugal
3 MD, Department of Children’s Orthopedics, Centro Hospitalar Lisboa Central, Lisbon, Portugal
Address correspondence to:
Raquel Teixeira
Estrada Forte do Alto Duque, 1449-005 Lisbon,
Portugal
Message to Corresponding Author
Article ID: 100023Z14RT2021
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How to cite this article
Teixeira R, Pimentel J, Norte S, Arcângelo J, Tavares D. A rare case of extra-articular pigmented villonodular synovitis of the knee in a child. J Case Rep Images Orthop Rheum 2021;5:100023Z14RT2021.ABSTRACT
Introduction: Pigmented villonodular synovitis (PVNS) is a benign proliferative disorder that affects the synovial joint, tendon sheaths, and bursa membranes. It is a rare condition of unknown etiology, with only around 100 cases in the pediatric population reported in the literature. To the authors’ knowledge, this is the first case of extra-articular PVNS of the knee in a child.
Case Report: We report a case of a 10-year-old boy, with localized extra-articular PVNS of the knee. The child presented with a 4-month history of a slow growing mass in the lateral-superior aspect of the left knee, which appeared after a minor trauma. The child had no pain, joint effusion or movement impairment. Magnetic resonance imaging (MRI) revealed a cystic lesion with multiple septae, with no specific diagnosis. Excisional biopsy was performed, and the histopathology revealed the diagnosis of PVNS.
Conclusion: Pigmented villonodular synovitis is a rare disorder but can present in children as an intra-articular or extra-articular lesion. The diagnosis can be difficult, as the clinic is unspecific, and exams may not be diagnostic. The preferred treatment is surgical excision, but recurrence can occur.
Keywords: Knee, Pediatric, Tumor, Villonodular synovitis
SUPPORTING INFORMATION
Author Contributions
Raquel Teixeira - Substantial contributions to conception and design, Interpretation of data, Drafting the article, Final approval of the version to be published
João Pimentel - Acquisition of data, Interpretation of data, Revising it critically for important intellectual content, Final approval of the version to be published
Susana Norte - Acquisition of data, Interpretation of data, Revising it critically for important intellectual content, Final approval of the version to be published
Joana Arcângelo - Analysis of data, Revising it critically for important intellectual content, Final approval of the version to be published
Delfin Tavares - Analysis of data, Revising it critically for important intellectual content, Final approval of the version to be published
Guarantor of SubmissionThe corresponding author is the guarantor of submission.
Source of SupportNone
Consent StatementWritten informed consent was obtained from the patient for publication of this article.
Data AvailabilityAll relevant data are within the paper and its Supporting Information files.
Conflict of InterestAuthors declare no conflict of interest.
Copyright© 2021 Raquel Teixeira et al. This article is distributed under the terms of Creative Commons Attribution License which permits unrestricted use, distribution and reproduction in any medium provided the original author(s) and original publisher are properly credited. Please see the copyright policy on the journal website for more information.
