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Figure 10


Fig. 4D —Incidental enchondroma of distal femur and small subchondral cyst or intraosseous ganglion in 53-year-old woman with knee pain associated with medial and lateral meniscal tears. Sagittal T1-weighted (C, 550/15) and gradient-echo (D, 577/10; flip angle, 30°) MR images reveal cleftlike extension to subchondral bone (arrowheads) that shows high signal intensity on long-TR and gradient-echo images. This feature is not seen in enchondromas and suggests correct diagnosis of subchondral cyst or intraosseous ganglion. Note distal femoral enchondroma (arrows) with typical features on sagittal images.