Extra-axial

Last revised by Bahman Rasuli on 30 Mar 2021

Extra-axial is a descriptive term to denote lesions that are external to the brain parenchyma, in contrast to intra-axial which describes lesions within the brain substance. 

Often it is trivially easy to distinguish an intra-axial from an extra-axial mass. In many cases, especially when the mass is large and associated with parenchymal changes, such as edema, localization can be more difficult. A number of features are helpful in suggesting that a mass or lesion is extra-axial, including: 

Examples (non-exhaustive) of extra-axial lesions include:

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