Items tagged “spine”
156 results found
Article
Naked facet sign (vertebral column)
The naked facet sign (also known as the hamburger sign or reverse hamburger bun sign) refers to the CT appearance of an uncovered vertebral articular facet when the facet joint is dislocated, most often in cases of locked facet.
This CT sign is characteristic of a flexion-distraction injury an...
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
Diffusion tensor imaging and fiber tractography
Diffusion tensor imaging (DTI) is an MRI technique that uses anisotropic diffusion to estimate the axonal (white matter) organization of the brain.
Fiber tractography (FT) is a 3D reconstruction technique to assess neural tracts using data collected by diffusion tensor imaging.
Diffusion-weigh...
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Vertebral lesion (differential)
Differential diagnosis of vertebral lesions is very wide.
Differential diagnosis
Vertebral body origin
intraosseous hemangioma
metastases
Paget disease
multiple myeloma
osteonecrosis
vertebral body osteomyelitis
lymphoma
plasmacytoma
giant cell tumor
Langerhans...
Article
Castellvi classification of lumbosacral transitional vertebrae
The Castellvi classification is used for lumbosacral transitional vertebra (LSTV):
type I: enlarged and dysplastic transverse process (at least 19 mm)
Ia: unilateral
Ib: bilateral
type II: pseudoarticulation of the transverse process and sacrum with incomplete lumbarization/sacralization; en...
Article
Grading of brachial plexus injuries
According to CT myelography, brachial plexus injuries can be classified into six types 1:
N type: normal root sleeve and nerve roots
A1 type: slightly deformed root sleeves and nerve roots as compared to unaffected site
A2 type: obliteration of the tip of root sleeves and deformed thickened n...
Article
Brachial plexus injuries
Brachial plexus injuries are a spectrum of upper limb neurological deficits secondary to partial or complete injury to the brachial plexus, which provides the nerve supply of upper limb muscles.
Clinical presentation
Trauma, usually by motor vehicle accidents, involves severe traction on the ...
Article
Fluid sign (vertebral collapse)
The fluid sign is one of the radiological features of osteoporotic fractures, and can be helpful in distinguishing them from metastatic vertebral fractures, as it is seen more often in osteoporotic fractures and is rarely seen in metastatic fractures 1. It is not as helpful as identifying a para...
Article
Brachial plexus
The brachial plexus is a complex neural network formed by lower cervical and upper thoracic ventral nerve roots which supplies motor and sensory innervation to the upper limb and pectoral girdle. It is located in the neck extending into the axilla posterior to the clavicle.
Summary
origin: ven...
Article
Osteoarthritis of the vertebral column
Osteoarthritis of the vertebral column, also known as spinal osteoarthritis, is so common that it is widely known as spinal "degenerative change". Complications such as spinal stenosis are important to recognize.
Radiographic features
Spinal osteoarthritis presents radiologically like other j...
Article
Vertebral hemangioma
Vertebral hemangiomas are the most common benign vertebral neoplasms. That said, they are not true neoplasms but venous malformations. They are usually asymptomatic and incidentally detected due to their characteristic features on imaging for other reasons. Rarely, they can be locally aggressive...
Article
Occipital vertebra
Occipital vertebrae are rare anatomical variants that result from incomplete or aberrant fusion of occipital bone ossification centers. There is a broad spectrum of occipital vertebrae, the more common variants include:
third condyle (condylus tertius)
basilar process
prebasioccipital arch
p...
Article
Vanishing vertebrae
Vanishing vertebrae is a rare ischemic manifestation of sickle cell disease, in which a completely infarcted vertebral body literally disappears or vanishes, as a result of infarction. In the few reported cases, the posterior elements remain intact.
See also
codfish or h-shaped vertebrae
ante...
Article
Opticospinal multiple sclerosis
Opticospinal multiple sclerosis (OSMS) is a demyelinating disease and has been considered a variant of multiple sclerosis (MS) encountered in Asian populations, who are generally rarely affected by normal multiple sclerosis. It has similar clinical and imaging features to neuromyelitis optica (N...
Article
HIV-related vacuolar myelopathy
HIV-related vacuolar myelopathy, also known as AIDS-related myelopathy, is the most common chronic myelopathy associated with HIV infection and is typically seen in the late stages of the disease.
Clinical presentation
Patients tend to have slowly progressive weakness of the lower extremities,...
Article
Bullet-shaped vertebra
Bullet-shaped vertebra, also known as ovoid vertebra, refers to the anterior beaking of the vertebral body.
It is seen in the following conditions:
mucopolysaccharidosis (Morquio disease, Hurler disease)
achondroplasia
congenital hypothyroidism
progressive pseudorheumatoid dysplasia 4
Wils...
Article
MRI classification system for lumbar disc degeneration
Disc degeneration can be graded on MRI T2 weighted images.
Usage
The Pfirrmann grading system is the most widely known classification for intervertebral disc degeneration and is used in both clinical and research capabilities 2,3. The intra- and inter-observer agreement of the Pfirrmann gradin...
Article
Angiolipoma
Angiolipomas are rare soft tissue tumors composed of mature adipocytes and vessels. They most commonly arise in the subcutaneous tissues of the extremities.
Please refer to the epidural (spinal) angiolipoma article for a specific discussion. The remainder of this article describes the general f...
Article
Epidural angiolipoma
Epidural angiolipomas are rare benign tumors composed of mature adipocytes and abnormal vessels.
Epidemiology
Epidural angiolipomas are more frequently encountered in women, and typically in middle age (40-50 years of age) 1.
Clinical presentation
In keeping with the slow growth of these t...
Article
Atlanto-occipital assimilation
Atlanto-occipital assimilation is the fusion of the atlas (C1) to the occiput and is one of the transitional vertebrae.
Epidemiology
Atlanto-occipital assimilation occurs in approximately 0.5% (range 0.08-3%) of the population 2-5. It is thought to affect males and females equally.
Associati...