Jul 27, 2022 · 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.

Glioma is a term used to describe a group of tumors that start in glial cells in the brain. These cells support the function of the other main brain cell type, the neuron. Gliomas often happen in the …

Jul 2, 2008 · When we study an intracranial mass, the first thing we want to know is whether the mass lies in- or outside of the brain. If it is outside the brain or extra-axial, then the lesion is not actually a brain tumor, but derived from the lining of the brain or surrounding structures.

Dec 12, 2020 · Click here to read about the six findings that will differentiate intra- and extra-axial tumors on brain CT. When examining computed tomography (CT) scans, you will eventually …

Jan 22, 2016 · Most intra-axial neoplasms are of glial origin, accounting for 40% to 50% of primary CNS neoplasms. 1 The glial neoplasms arise from astrocytes, oligodendrocytes, ependymal cells, or their derivatives in the choroid plexus.

Sep 8, 2016 · Dissemination that occurs through the white matter tracts (invasion is evidenced by DTI with low fractional anisotropy in abnormal tracts), ependyma, and subarachnoid space is relatively common. Imaging studies show them as an inhomogeneous mass, surrounded by edema, and sometimes peripheral and/or central areas of enhancement.

Jul 9, 2023 · A tumor located inside the brain parenchyma is called an “intra-axial” brain tumor, a tumor outside the brain parenchyma is an “extra-axial” brain tumor. There are a lot of tips and tricks you can use to make that distinction. The most reliable sign is the CSF-cleft sign.

Oct 1, 2006 · The role of the most commonly used advanced MR imaging techniques—perfusion imaging, diffusion-weighted imaging, and MR spectroscopy—in the diagnosis and classification of the most common intraaxial brain tumors in adults is explored.

May 1, 2007 · Purpose: To develop and retrospectively determine the accuracy of a magnetic resonance (MR) imaging strategy to differentiate intraaxial brain masses, with histologic findings or clinical diagnosis as the reference standard. Materials and Methods: The study was HIPAA compliant and was approved by the institutional review board.

Oct 18, 2020 · Intra-axial tumors are located within the brain parenchyma and arise from brain cells. Imaging: Peritumoral vasogenic white matter edema is usually noted. Examples: Tumors arising from glial cells, neuroglial cells—diffuse astrocytic and oligodendroglial tumors, Grade II, III, IV, low-grade astrocytomas, ependymal tumors, embryonal tumors.