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M e d i c a l E d u c a t i o n 610 CASE PRESENTATION A 14-year-old boy presented with anterior left knee pain of two weeks' duration with no history of trauma. The knee pain was aggravated by exercise and relieved by rest. On physical examination, there was focal tenderness at the left tibial tuberosity, and the pain was reproducible on forced extension of the knee. The rest of the knee examination did not reveal any joint instability. Radiography of the knee was performed (Fig. 1a). What does the image show and what is the diagnosis? As the pain persisted, magnetic resonance (MR) imaging of the knee was subsequently performed (Figs. 1b & c). What do the images show? CMEArticle