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Figure 1. A 19-year-old man presented with a five-year history of a gradually increasing mass on the lateral aspect of his right knee. He first noted this mass after receiving a direct blow to the area while playing ice hockey. Magnetic resonance imaging showed a hyperintense synovial lesion with bulging or distention of the lateral capsule and retinacular complex (arrow in Panel A); the bones and menisci were normal. Arthroscopy revealed a pedunculated, grape-like lesion (arrow in Panel B) arising from the synovium in the lateral parapatellar gutter (arrowhead). The biopsy showed thick-walled, prominent vascular channels surrounded by fibrous . . . [Full Text of this Article] |
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