Figure 3d. Ganglioglioma in a 15-year-old girl who experienced a generalized tonic-clonic seizure. (a) Axial CT image shows a heavily calcified mass (arrows) of the posterior right temporal lobe. The mass is otherwise hypoattenuating. (b) Axial T1-weighted MR image better shows the true size of the lesion. It is heterogeneously hypointense with a central region of ringlike high signal intensity (arrowheads), an appearance that corresponds to the calcification seen at CT. (c) Axial T2-weighted MR image shows high signal intensity of the mass without evidence of surrounding vasogenic edema. (d) Contrast material-enhanced axial T1-weighted MR image shows ringlike enhancement of the mass.