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A giant medial parameniscal cyst of the knee joint

A 34-year-old man presented with a painful large mass over the medial aspect of his left knee that enlarged during the last 6 months. The pain was increasing when standing after squatting and while descending the stairs. On physical examination, the lesion was firm and immobile and there was slight tenderness with palpation (figure 1A). Knee joint movements were normal without ligamentous instability, but McMurray test was painful in the medial meniscus. He could not remember any exact trauma. His medical history was unremarkable. Plain radiographs revealed only a faint soft tissue expansion at the level of the knee joint without any other bony lesion or deformity (figure 1B,C). MRI showed a large parameniscal cyst (50×15×42 mm) extending medially …