MR images show two cases of mild HPE. Both cases were classified as lobar HPE and have sylvian angles of 25°. Both have small, dysplastic frontal horns and both have a large amount of brain tissue anterior to the sylvian fissures.
A and B, Spin-echo (2500/120) MR images show normal-appearing sulci and gyri in the posterior two-thirds.
C and D, Inversion-recovery (2000/800/inversion time, 12 ms) MR images show normal-appearing sulci and gyri in the posterior half. The medial frontal sulci appear dysplastic.