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Fig. 2C. —30-year-old man, former college swimmer who experienced acute shoulder pain while bench pressing. Cartilage defect was not diagnosed prospectively on MR imaging but only seen in retrospect after arthroscopic identification. Arthroscopic image reveals fraying and thickening (curved arrow) of articular cartilage of humeral head (H) and large focal defect (straight arrows) seen on MR imaging (A and B). Glenoid (G) was normal on MR imaging (A and B) and on arthroscopy (C).