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Carpal bones. a, b Coronal T1-weighted turbo spin-echo MRI in a 12-year-old boy (a) shows smooth carpal bones. Four-year follow-up MRI (b) shows several new bony depressions in almost all carpal bones (arrowheads). c Coronal water-selective (coronal volumetric steady-state spoiled gradient echo) cartilage sequence shows that all carpal depressions are covered by cartilage at follow-up
