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(A) Preoperative magnetic resonance imaging of the left knee reveals a 1.5-cm region of full-thickness cartilage loss in the femoral trochlea (arrow) on the sagittal view. Underlying the lesion is a 6 × 8-mm subchondral cyst (arrow) that can be seen on sagittal (B), coronal (C), and axial (D) views.
