FIG 3. Focal cortical dysplasia of the Taylor balloon cell type (FCD_BC). Images in a and b show a small lesion in the depth of the left frontal superior sulcus (arrow). Image in c shows a huge lesion and a small lesion (arrow) in the right parietal and occipital lobe. Image in d shows a lesion under an atrophic left superior frontal gyrus. The MR imaging hallmark of FCD_BC is a subcortical hyperintensity tapering toward the lateral ventricle. It is clearly visible (arrow), but because of atrophy of the superior frontal gyrus, the lesion was mistaken for gyral scarring.