Oct 4, 2024 · 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.

Many neoplasms that typically affect the brain parenchyma (intra-axial), such as gliomas, may also present with primary or secondary extra-axial involvement. This chapter provides a general and concise overview of the common types of extra …

There are many kinds of extra-axial brain tumors and tumor-like lesions, and definitive diagnosis is complicated in some cases. In this pictorial essay, we present rare and challenging extra-axial brain lesions including neuroenteric cyst, primary ...

Dec 12, 2020 · An extra-axial mass resides on the outside of the brain, while an intra-axial mass resides within the brain itself. So, be thoughtful about this first step of assigning location! An error in predicting the location of a mass will very likely result in errors when predicting the tumor’s histology and expected behavior.

Nov 23, 2021 · Extra-axial masses of the intracranial compartment have a wide range of differentials, ranging from benign developmental cysts to malignant tumors. Differential diagnosis. neoplasms. chordoma; choroid plexus papilloma/carcinoma; cranial nerve schwannoma; meninges. meningioma; solitary fibrous tumors of the dura (hemangiopericytoma) dural ...

Apr 2, 2018 · Extra-axial collections are collections of fluid within the skull, but outside the brain parenchyma. They may be comprised of CSF, blood or pus and may exist in the extradural, subdural or subarachnoid space.

Dec 12, 2020 · Let’s examine several cases which will demonstrate how to distinguish between the four common types of extra-axial masses in adults using brain computed tomography (CT) and magnetic resonance imaging (MRI): Vestibular schwannoma; Meningioma; Epidermoid tumor; …

There are three types of extra-axial haemorrhage: extradural haematoma, subdural haematoma, and subarachnoid haemorrhage. Extradural (or epidural) haematoma is a post-traumatic event resulting from injury to an intracranial artery, most commonly the middle meningeal artery.

Jul 2, 2008 · Extra-axial tumors are not derived from brain tissue and do not have a blood-brain-barrier, so most of them enhance homogeneously.

May 28, 2020 · Extra-axial lesions arise from the skull, meninges, or tissues other than the brain parenchyma. Intra-axial lesions are located in the brain. Extra-axial lesions are characterized as being within epidural, subdural, and/or subarachnoid spaces or compartments.