====== Intra-axial ======
 

Intra-[[axial]] is a term that denotes lesions that are within the [[brain parenchyma]], in contrast to [[extra-axial]], which describes lesions outside the [[brain]], and [[intraventricular]], which denotes lesions within the [[ventricular system]]. Some authors include intraventricular lesions in the intra-axial group as most are lesions that arise from the brain parenchyma and grow exophytically into the ventricular system.