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Base of the fourth metacarpal bone. a, b Coronal T1-weighted turbo spin-echo MRI demonstrates a smooth outline in a 10-year-old girl (a); however two depressions, one proximal (arrowhead) and one distal (arrow), are seen at 4-year follow-up (b). c Coronal water-selective (volumetric steady-state spoiled gradient echo) cartilage sequence at 4-year follow-up shows that the proximal depression is covered but the distal is not
