FCD type I in a 26-year-old patient with a history of seizure onset at 14 years of age. The T1-weighted axial image (A), PET image (B), and fused image (C) have normal findings. D and E, ASL and ASL-T1WI fused images (circles) show a well-defined area of focal hypoperfusion in the left temporal lobe region. After a left temporal lobe resection, pathologic findings were consistent with FCD type I. The patient had a follow-up time of >1 year, showing Engel class I outcome.