Articles
Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and continuously improved upon by countless contributing members. Our dedicated editors oversee each edit for accuracy and style. Find out more about articles.
88 results found
Article
Raymond–Roy occlusion classification of intracranial aneurysms
The Raymond–Roy occlusion classification (RROC) is an angiographic classification scheme for grading the occlusion of endovascularly treated intracranial aneurysms 1. It is also known as the Raymond class, Montreal scale or the Raymond Montreal scale.
class I: complete obliteration
class II: r...
Article
Boston criteria 2.0 for cerebral amyloid angiopathy
The Boston criteria 2.0 were proposed in 2022 in order to better include leptomeningeal and white matter characteristics into the diagnoses of probable and possible cerebral amyloid angiopathy (CAA) 1. They consist of combined clinical, imaging and pathological parameters, and are based upon the...
Article
Cognard classification of dural arteriovenous fistulas
The Cognard classification of dural arteriovenous fistulas (dAVF) correlates venous drainage patterns with increasingly aggressive neurological clinical course and stratifies the risk of intracerebral hemorrhage. It was first described in 1995 1 and at the time of writing (July 2016) is probably...
Article
Bouthillier classification of internal carotid artery segments
Alain Bouthillier et al. described a seven segment internal carotid artery classification system in 1996 1. It remains the most widely used system for describing the internal carotid artery segments.
A helpful mnemonic for remembering ICA segments is:
C'mon Please Learn Carotid Clinical Organ...
Article
Medial temporal lobe atrophy score
The medial temporal lobe atrophy (MTA) score, also known as Scheltens' scale, is useful in distinguishing patients with mild cognitive impairment and Alzheimer disease from those without impairment 2 is helpful in the assessment of patients with possible dementia (see neurodegenerative MRI brain...
Article
Epidural spinal cord compression scale
The epidural spinal cord compression (ESCC) scale, sometimes known eponymously as the Bilsky scale, is used to assess the degree to which vertebral body metastasis compromises the spinal canal and whether cord compression is present. It may serve as a guide as to when intervention (radiotherapy ...
Article
International panel for NMO diagnosis criteria
The 2015 International Panel for NMO Diagnosis criteria is, as the name implies, a set of criteria used to diagnose neuromyelitis optica spectrum disorder (NMOSD) 1. They are based on a combination of clinical, laboratory, and neuroimaging findings.
Criteria
Diagnostic criteria for NMOSD with ...
Article
Edinburgh criteria for lobar intracerebral hemorrhage associated with cerebral amyloid angiopathy
The Edinburgh criteria were proposed in 2018 in order to diagnose lobar intracerebral hemorrhage associated with cerebral amyloid angiopathy (CAA) 1. They can potentially be used to rule CAA-associated lobar hemorrhage either in or out, but require external validation in other patient population...
Article
Fisher scale
The Fisher scale is the initial and best-known system of classifying the amount of subarachnoid hemorrhage on CT scans, described in 1980 4. Its primary use was in predicting the occurrence and severity of cerebral vasospasm, highest in grade 3 2,4.
Usage
Although it is known as a scale, fro...
Article
Tumors of the meninges (differential)
Tumors of the meninges are a heterogeneous group of lesions which usually occur as extra-axial masses. Although a large number of lesions that can involve meninges are scattered throughout the WHO classification of CNS tumors, the main entities to be considered include:
meningioma and numero...
Article
Modified Fisher scale
The modified Fisher scale is a method for radiological grading subarachnoid hemorrhage (SAH) secondary to intracranial aneurysm rupture, assessed on the first non-contrast CT.
It was modified from the original Fisher scale to account for patients with thick cisternal blood and concomitant intra...
Article
Diffuse axonal injury (grading)
Grading of diffuse axonal injury due to trauma is described according to the anatomic distribution of injury. Contrary to the implication of the word "diffuse," diffuse axonal injury has a topological predilection for focal involvement of certain sites in the brain. These sites, in turn, vary in...
Article
NeuroImaging Radiological Interpretation System (NIRIS) for acute traumatic brain injury
The NeuroImaging Radiological Interpretation System (NIRIS) is a scheme for structured contextual reporting of CT head examinations of suspected head injuries.
The NIRIS was proposed 1 in 2018 by a multi-institute group of neuroradiologists based at Stanford University. Its unique objective is ...
Article
Normal bone marrow signal of the clivus
Bone marrow signal of the clivus changes predictably with age and is well assessed with midline T1 non-fat-saturated, non-contrast images. As is seen in the rest of the body the proportion of yellow (fatty) marrow increases with age. Knowledge of these changes allows the diagnosis of the abnorma...
Article
McDonald diagnostic criteria for multiple sclerosis
McDonald diagnostic criteria for multiple sclerosis are clinical, radiographic, and laboratory criteria used in the diagnosis of multiple sclerosis. They were originally introduced in 2001 and revised multiple times (see "previous versions" below) most recently in 2017 5.
Criteria
The diagnos...
Article
Marshall classification of traumatic brain injury
The Marshall classification of traumatic brain injury is a CT scan derived metric using only a few features and has been shown to predict outcome in patients with traumatic brain injury.
This system was first published in 1992 1 building on findings from a large cohort of head injury cases des...
Article
Hunt and Hess grading system
The Hunt and Hess scale describes the clinical severity of subarachnoid hemorrhage resulting from the rupture of an intracerebral aneurysm and is used as a predictor of survival.
grade 1
asymptomatic or minimal headache and slight neck stiffness
70% survival
grade 2
moderate to severe heada...
Article
Heidelberg bleeding classification
The Heidelberg bleeding classification categorizes intracranial hemorrhages (hemorrhagic transformation) occurring after ischemic stroke and reperfusion therapy.
Anatomic description
Class 1: hemorrhagic transformation of infarcted brain tissue
1a: HI1: scattered small petechiae, no mass effe...
Article
Borden classification of dural arteriovenous fistulas
The Borden classification of dural arteriovenous fistulas (DAVF) groups these lesions into three types based upon the site of venous drainage and the presence or absence of cortical venous drainage. It was first proposed in 1995 1. At the time of writing (July 2016), it is probably less popular ...
Article
Kernohan grading system for diffuse astroctyomas
The Kernohan grading system for diffuse astrocytomas is no longer used, superseded by the WHO grading system.
It was first described in 1949 and divided astrocytomas into 4 grades (I - IV) on the basis of histological features 1.