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[Extra-articular localization of nodular synovitis: a case report]
F Gassel1, T Wallny, U A Wagner
1Klinik und Poliklinik für Orthopädie, Universität Bonn.
Introduction:
The extra-articular nodular synovitis is regarded as a rare case of the common pigmented villonodular synovitis. The following report points out a case with wide extension in a young man's proximal lower leg.
Case-Report:
A 24-year-old man complained about a non-painful tumor at his left proximal lower leg without any clinical handicap. Some years before he got a fracture of the proximal left tibia caused by an adequate sports trauma. So he had to undergo two operative investigations. The radiographs showed a transparent soft tissue tumor, which displaced the corticalis of the bone for some centimeters. The magnetic resonance imaging did not hint at a malignant process. After operative treatment the diagnosis was confirmed by histology.
Conclusion:
By operative and histological investigation advice could given to a benign tumor. The etiology of the extra-articular nodular synovitis is to be regarded as unknown. In our case a dislocation of synovial cells to extra-articular should be discussed.