Figure 3c. Abnormal cartilage demonstrated with different MR imaging sequences. (a) Sagittal spin-echo T2-weighted image (2,000/80) shows subtle cartilage abnormality (arrow) in the lateral femoral condyle. (b) Sagittal three-dimensional volume spoiled gradient-echo fat-suppressed image (60/5; flip angle, 40°) through the same area as in a shows the articular cartilage to have marked high signal intensity with smooth margins, while abnormal cartilage (arrow) has low signal intensity. (c) Coronal fast spin-echo T2-weighted image (3,000/70) in the same patient shows the cartilage defect (arrow) in the lateral femoral condyle.