Ictal and interictal Arterial Spin Labelling (ASL) in hemimegalencephaly.

The article describes the case of a one-month-old baby without any perinatal insult presented with left focal seizures since day 12 of life. Topics discussed include the use of ictal and interictal single photon emission-computed tomography (SPECT) and positron imaging tomography (PET) to detect metabolic changes related to epileptic activity, information on arterial spin labelling (ASL), and reason that the cerebral blood flow (CBF) is typically increased in the acute peri-ictal period.