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Cervical spine

The cervical spine is the upper part of the spine extending from the skull base to the thorax at the level of the first vertebra with a rib attached to it. It normally consists of seven vertebrae. Its main function is to support the skull and maintain the relative positions of the brain and spin...

Cervical spine alignment

When assessing cervical spine alignment, look for four parallel lines connecting structures in the cervical spine: anterior vertebral line: anterior margin of the vertebral bodies posterior vertebral line: posterior margin of the vertebral bodies spinolaminar line: posterior margin of the spi...

Cervical spine (flexion-extension views)

Cervical spine flexion-extension lateral views are specialised projections of the cervical spine often requested to assess for spinal stability. Cervical spine flexion-extension lateral views should not be performed on trauma patients without strict instructions of a qualified clinician. Patie...

Cervical spine floating pillar

A floating pillar, also referred as pedicolaminar fracture-separation injury, is characterised by fractures through the pedicle and lamina of a cervical spine vertebrae creating a free-floating articular pillar fragment. It is an unstable cervical spine fracture that results from hyperflexion–la...

Cervical spine fracture classification systems

There are several cervical spine fracture classification systems: Anderson and D'Alonzo classification (odontoid fracture) Roy-Camille classification (odontoid fracture) Levine and Edwards classification (for traumatic injuries to axis) Allen and Ferguson classification (subaxial spine injur...

Cervical spine fractures

Cervical spine fractures can occur secondary to exaggerated flexion or extension, or because of direct trauma or axial loading. Pathology The cervical spine is susceptible to injury because it is highly mobile with relatively small vertebral bodies and supports the head which is both heavy and...

Cervical spine injury

Cervical spine injuries can involve the cervical vertebral column, intervertebral discs and cervical spine ligaments, and/or cervical spinal cord. The cervical spine accounts for ~50% of all spinal injuries. Epidemiology 5-10% of patients with blunt trauma have a cervical spine injury 1. Pa...

Cervical spine (lateral view)

Cervical spine lateral view is a lateral projection of the cervical spine. It is often performed in the setting of trauma. As technology advances, computed tomography (CT) has replaced this projection, yet there remain many institutions (especially in rural areas) where CT is not readily availa...

Cervical spine ligaments

Cervical spine ligaments ordered from anterior to posterior include: anterior longitudinal ligament (ALL) anterior atlanto-occipital membrane apical ligament alar ligaments (paired) cruciate ligament of the atlas longitudinal band: joins the body of the axis to the foramen magnum transver...

Cervical spine (odontoid view)

The odontoid or 'peg' projection is an AP projection of C1 (atlas) and C2 (axis). Patient position patient positioned erect in AP position unless trauma the patient will be supine patient’s shoulders should be at equal distances from the image receptor to avoid rotation, the head facing strai...

Cervical spine series

The cervical spine series is a set of radiographs taken to investigate the bony structures of the cervical spine, albeit commonly replaced by the CT, the cervical spine series is an essential trauma radiograph for all radiographers to understand. Indications Cervical spine radiographs are indi...

Chalk stick fracture

Chalk stick or carrot stick fractures are fractures of the fused spine, classically seen in ankylosing spondylitis. Terminology Some authors define the chalk stick fracture as a fracture through a Pagetoid long bone (see Paget disease). Pathology They usually occur through the disco-vertebra...

Chamberlain line

Chamberlain line is a line joining the back of hard palate with the opisthion on a lateral view of the craniocervical junction. Significance It helps to recognise basilar invagination which is said to be present if the tip of the dens is >3 mm above this line. McGregor developed a modificatio...

Chance fracture

Chance fractures, also referred to as seatbelt fractures, are flexion-distraction type injuries of the spine that extend to involve all three spinal columns. These are unstable injuries and have a high association with intra-abdominal injuries. Pathology Mechanism They tend to occur from a fl...

Charcot-Marie-Tooth disease

Charcot-Marie-Tooth (CMT) disease, also known as hereditary motor and sensory neuropathy (HMSN), is the most commonly inherited neuropathy of lower motor (to a lesser degree sensory) neurons. Epidemiology The prevalence of CMT in one Norwegian study was 82.3 cases per 100,000 people 4. Clini...

Chest x-ray: disability (summary)

This is a basic article for medical students and other non-radiologists Chest x-ray review is a key competency for medical students, junior doctors and other allied health professionals. Using A, B, C, D, E is a helpful and systematic method for chest x-ray review where D refers to disability a...

Chordoma

Chordomas are uncommon malignant tumours of the axial skeleton that account for 1% of intracranial tumours and 4% of all primary bone tumours. They originate from embryonic remnants of the primitive notochord (earliest fetal axial skeleton, extending from the Rathke's pouch to the tip of the c...

Clasp-knife deformity

Clasp-knife deformity is relatively common congenital anomaly found at the lumbosacral junction. Terminology When a clasp-knife deformity is accompanied by pain on extension secondary to protrusion of the enlarged spinous process (knife blade) into the sacral spinal canal, it is called clasp-k...

Classification of spinal meningeal cysts

Spinal meningeal cysts can be classified according to a system published by Nabor et. al 2: type I: extradural meningeal cyst without neural tissue type Ia: extradural spinal arachnoid cyst type Ib: sacral meningocele type II: extradural meningeal cyst containing neural tissue, e.g. Tarlov c...

Clay-shoveler fracture

Clay-shoveler fractures are fractures of the spinous process of a lower cervical vertebra. Clinical presentation Often these injuries are unrecognised at the time and only found incidentally years later when the cervical spine is imaged for other reasons. Acutely they tend to be associated wi...

Cobb angle

The Cobb angle is the most widely used measurement to quantify the magnitude of spinal deformities, especially in the case of scoliosis, on plain radiographs. A scoliosis is defined as a lateral spinal curvature with a Cobb angle of 10° or more 4. Measurement To measure the Cobb angle, one mus...

Coccidioidomycosis

Coccidioidomycosis refers to an infection caused by the dimorphic fungus Coccidioides spp, usually localised to the lungs. This disease is not to be confused with the similarly named paracoccidioidomycosis. Epidemiology The most common forms of Coccidioides spp are Coccidioides immitis and Coc...

Coccyx

The coccyx (plural: coccyges) is the series of rudimentary vertebrae forming the caudal termination of the vertebral column and is positioned inferior to the apex of the sacrum. The coccyx is one leg of the tripod formed in conjunction with the ischial tuberosities for support in a seated positi...

Column of Burdach

The column of Burdach, also known as the cuneate fasciculus or fasciculus cuneate, represents the lateral portion of the dorsal columns and carries input from between and including C1 and T6 1. Function The cuneate fasciculus is responsible for transmitting vibration, conscious proprioception...

Column of Goll

The column of Goll, also known as the gracile fasciculus or fasciculus gracilis, represents the medial portion of the dorsal columns and carries input from below and including T7 1. Function The gracile fasciculus is responsible for transmitting vibration, conscious proprioception, and fine (d...

Compressive myelopathy

Compressive myelopathy refers to neurological deficits that result from abnormal compression of the spinal cord. It most commonly occurs in the cervical spinal cord. Pathology Any cause of central canal stenosis including disc herniation, osteophytes, extradural mass, and/or paravertebral lig...

Congenital absence of a spine pedicle

Congenital absence of a spine pedicle is a rare congenital condition, but awareness of its characteristic imaging appearance is important to avoid misdiagnosis. Failure to recognise this entity can lead to misdiagnosis of unilateral facet subluxation/dislocation, leading to unnecessary treatmen...

Congenital anomalies of the posterior atlas arch

Congenital anomalies of the posterior arch of the atlas (C1) are relatively common anomalies. They may range from partial defects presenting as clefts to complete absence of the posterior arch (aplasia). These anomalies are classified according to Currarino (see below). It should not be confuse...

Congenital lumbar spinal stenosis

Congenital lumbar spinal stenosis (CLSS) is a type of spinal canal stenosis and has a different epidemiology with less severe degenerative change compared to acquired/degenerative lumbar spinal stenosis. Epidemiology CLSS tends to affect patients at a younger age (30-50 years old) than lumbar...

Conus medullaris

The conus medullaris is the terminal end of the spinal cord. Gross anatomy After the cord terminates, the nerve roots descend within the spinal canal as individual rootlets, collectively termed the cauda equina. The conus medullaris most commonly terminates at the L1/2 intervertebral disc leve...

Conus medullaris syndrome

Conus medullaris syndrome is caused by an injury or insult to the conus medullaris and lumbar nerve roots. It is a clinical subset of spinal cord injury syndromes. Injuries at the level of T12 to L2 vertebrae are most likely to result in conus medullaris syndrome. Pathology The conus medullari...

Corduroy sign (vertebral haemangioma)

The corduroy sign refers to vertically-oriented, thickened trabeculae seen in intraosseous haemangiomas of the spine. It is the sagittal/coronal equivalent of the polka-dot sign seen on axial imaging. It is caused by the replacement of the normal cancellous bone by thickened vertical trabecula...

Coronal balance

Coronal balance is one of the features that needs to be assessed on long spine radiographs obtained for spinal deformity, particularly scoliosis. It measures whether or not the upper spine is located over the midline (normal) or off to one side. To assess coronal balance, a vertical (plumb) li...

Coronal vertebral cleft

Coronal vertebral cleft refers to the presence of a radiolucent vertical defect on a lateral radiograph. Epidemiology It is most often seen in premature male infants 1,3. As they can occur as part of normal variation (especially in the lower thoracic-upper lumbar spine of premature infants) ...

Corpectomy

Corpectomy (followed by fusion) refers to the removal of one or more vertebral bodies to treat compressive myelopathy caused by extensive hypertrophic osteoarthritis, tumour, infection or severe trauma. In most cases, the intervertebral discs are removed as well 1-3. Technique An anterior or ...

Cortical bone

The outer shell of compact bone is called cortical bone or cortex. Gross anatomy Cortical bone contains Haversian systems (osteons) which contain a central Haversian canal surrounded by osseous tissue in a concentric lamellar pattern. Two fibrovascular layers surround the cortical bone which...

Corticorubral tract

The corticorubral tract contains neurons that connect the primary motor and sensory areas to the red nucleus. The rubrospinal tract then descends through the spinal cord. The tract is thought to excite flexor muscles and inhibit extensor muscles. Gross anatomy Central connections The corti...

Craniovertebral junction anomalies

Craniovertebral junction (CVJ) anomalies can be congenital, developmental or due to malformation secondary to any acquired disease process. These anomalies can lead to cranial nerve compression, vertebral artery compression and obstructive hydrocephalus. Pathology The cranio-vertebral junctio...

Crowned dens syndrome

The crowned dens syndrome is an inflammatory condition resulting from crystal deposition in cruciform and alar ligaments surrounding the dens, appearing as a radiopaque 'crown' surrounding the top of the dens. It typically presents with pain and increased inflammatory markers. Terminology Th...

Cruciate ligament of the atlas

The cruciate ligament of the atlas (also known as the cruciform ligament) is an important ligamentous complex that holds the posterior dens of C2 in articulation at the median atlantoaxial joint. It lies behind a large synovial bursa (surrounded by loose fibrous capsule) and consists of two band...

CSF-venous fistula

CSF-venous fistulas are rare and only recently recognised causes of spontaneous intracranial hypotension. They are a direct communication between the spinal subarachnoid space and epidural veins allowing for the loss of CSF directly into the circulation and can be either iatrogenic or spontaneou...

Curtain sign

The curtain sign (or draped curtain sign) in neuroimaging refers to the appearance of a vertebral body mass that extends to the anterior epidural space. The posterior longitudinal ligament is strongly attached to the posterior vertebral body cortex in the midline and is more loosely attached la...

Cyst of the medullary conus

Cyst of the medullary conus is a rare benign ependymal cyst of the conus medullaris which probably relates to abnormal persistence and cystic dilatation of the ventriculus terminalis or "5th ventricle". This entity can be symptomatic and present in adulthood with bladder or bowel sphincter distu...

Dagger sign (spine)

The dagger sign is a radiographic feature seen in ankylosing spondylitis as a single central radiodense line on frontal radiographs related to ossification of the supraspinous and interspinous ligaments.

Degenerative disc disease

Degenerative disc disease (DDD) is an exceedingly common entity in the spine, encountered with increasing frequency throughout life and becoming almost universal in late adulthood to a varying degree. It is related to a combination of biomechanical stresses and genetic predisposition which alter...

Déjerine-Sottas disease

Déjerine-Sottas disease, also known as hereditary motor and sensory neuropathy type III or hypertrophic interstitial polyneuritis, is a rare hereditary motor and sensory neuropathy (HMSN). This syndrome should not be confused with Déjerine syndrome or Déjerine-Roussy syndrome. Clinical present...

Denticulate ligaments

The denticulate ligaments are bilateral triangular lateral extensions of pia mater that anchor the spinal cord to the dura mater. They are formed by pia mater of the spinal cord coursing in-between the dorsal and ventral nerve roots bilaterally. They function to provide stability to the spinal ...

Denver criteria for blunt cerebrovascular injury

The Denver criteria are a set of screening criteria for blunt cerebrovascular injury (BCVI) in trauma used to reduce the need for CT angiography and its associated radiation exposure. Screening criteria The screening protocol criteria 1,3 for BCVI are divided into signs and symptoms of BCVI a...

Diastematomyelia

Diastematomyelia, also known as a split cord malformation, refers to a type of spinal dysraphism (spina bifida occulta) when there is a longitudinal split in the spinal cord. Terminology Although traditionally it has been distinguished from diplomyelia (in which the cord is duplicated rather ...

Difference in vertical mid-vertical angle (lumbar spine)

The difference in vertical mid-vertical angle is the difference in the vertical mid-vertebral angle (VMVA) between the caudal segment angle and the adjacent cephalad segment angle of the three most caudal segments of the lumbar spine as measured on a mid-sagittal MRI or a lateral radiograph. Ra...

Diffuse idiopathic skeletal hyperostosis

Diffuse idiopathic skeletal hyperostosis (DISH), also referred to as Forestier disease, is a common condition characterised by bony proliferation at sites of tendinous and ligamentous insertion of the spine affecting elderly individuals. On imaging, it is typically characterised by the flowing o...

Diffusely increased bone marrow FDG uptake

A diffuse homogeneous bone marrow FDG uptake usually reflects hyperplastic bone marrow which can be seen in the following conditions: therapy-related granulocyte colony stimulating factor (G-CSF) post-chemotherapy erythropoietin pathological process myelodysplastic syndromes beta thalasse...

Diffuse T1 bone marrow signal loss

Diffuse T1 vertebral bone marrow signal loss has a number of causes. T1-weighted imaging without fat suppression is one of the most important sequences for distinguishing between normal and abnormal bone marrow. Given the homogeneity, this appearance can often be difficult to spot as abnormal. ...

Diplomyelia

Diplomyelia is a rare spinal cord malformation in which the cord is duplicated. It should be distinguished from diastematomyelia in which a single cord is split. Having said that it has been proposed that the term be abandoned in favour of split cord malformation, which encompasses both diastema...

Discal cyst

Discal cysts (also known as a disk cyst or disc cyst) are uncommon lesions of the spine, representing an extrathecal cyst which communicates with the adjacent intervertebral disc through an annular fissure. Epidemiology The vast majority of discal cysts, as rare as they are, have been reporte...

Disc bulge

A disc bulge represents displacement of the outer fibres of the annulus fibrosus beyond the margins of the adjacent vertebral bodies, involving more than one quarter (25% or 90 degrees) of the circumference of an intervertebral disc 3. Because it is limited by the annulus fibrosus it does not e...

Disc desiccation

Disc desiccation is an extremely common degenerative change of intervertebral discs. The incidence climbs with age, and to a large degree a gradual dehydration is a 'normal' part of disc ageing. It results from replacement of the hydrophilic glycosaminoglycans within the nucleus pulposus with fi...

Disc extrusion

Disc extrusion is a type of intervertebral disc herniation and is distinguished from a disc protrusion in that it: in at least one plane, has a broader dome (B) than a neck (A) and/or extends above or below the disc level (into the suprapedicular or infrapedicular zone) Disc extrusions are a...

Disc herniation

Disc herniation refers to the displacement of intervertebral disc material beyond the normal confines of the disc but involving less than 25% of the circumference (to distinguish it from a disc bulge). A herniation may contain nucleus pulposus, vertebral endplate cartilage, apophyseal bone/osteo...

Disc osteophyte complex

Disc osteophyte complex is a term used on MRI of the cervical spine to denote the presence of disc protrusion and/or marginal endplate osteophytes resulting in narrowing of the cervical canal. The term was introduced early in the practice of MRI as distinguishing between disc and osteophyte can ...

Disc protrusion

Disc protrusions are a type of disc herniation characterised by protrusion of disc content beyond the normal confines of the intervertebral disc, over an segment less than 25% of the circumference of the disc. The width of the base is wider than the largest diameter of the disc material which pr...

Disc sequestration

Sequestrated disc, also referred to as a free disc fragment, corresponds to extruded disc material that has no continuity with the parent disc and is displaced away from the site of extrusion. By definition, it corresponds to a subtype of disc extrusion. The term "migrated" disc refers only to ...

Dorsal columns

The dorsal columns, or posterior columns, are ascending pathways primarily concerned with sensory function. They are responsible for transmitting vibration, conscious proprioception, and fine (discriminative) touch 1,2. The dorsal columns are divided two tracts, which are discussed separately 2...

Dorsal dermal sinus

Dorsal dermal sinus (DDS) is an epithelium-lined tract from the skin to the spinal cord, cauda equina, or arachnoid. Pathology Dorsal dermal sinus is caused by incomplete separation of the superficial ectoderm from the neural ectoderm, resulting in a focal segmental adhesion. Later during emb...

Dorsal epidural disc migration

Dorsal epidural disc migration represents, as the name suggests, migration of disc material, usually a sequestrated disc fragment, into the dorsal (posterior) epidural space, posterior to the theca. This is a rare occurrence, often not suspected preoperatively and is almost invariably encountere...

Dorsal root ganglion

The dorsal root ganglia are an enlargement of the dorsal root of spinal nerves representing the cell bodies of the primary somatosensory neurons. Gross anatomy Each dorsal root ganglion is oval and proportional in size to its related root. They are usually found just distal to the intervertebr...

Dorsal thoracic arachnoid web

Dorsal thoracic arachnoid web refers to a thickened band of arachnoid over the dorsal aspect of the cord. It usually causes a focal thoracic cord distortion with consequent neurological dysfunction. On imaging, it is characterised by a focal dorsal indentation and anterior displacement of the ...

Dumbbell appearance of spinal tumours

The dumbbell appearance of spinal tumours refers to a tumour which has both a component within the canal and a component in the paravertebral space contiguous with each other via a thinner tumour component traversing the neural exit foramen. The appearance can be seen in: spinal nerve sheath t...

Dural ectasia

Dural ectasia refers to ballooning or widening of the dural sac which can result in posterior vertebral scalloping and is associated with herniation of nerve root sleeves. Clinical presentation Patients with dural ectasia may present with low back pain or radicular pain in the buttocks or legs...

Empty thecal sac sign

The empty thecal sac sign or empty sac sign is when the thecal sac appears empty on MRI of the lumbar spine, best seen on T2-weighted images. If the empty thecal sac sign is present, a diagnosis of adhesive arachnoiditis can be made. Radiographic features MRI There is usually no gadolinium c...

Ependymoma vs astrocytoma of the spinal cord

A number of factors are useful when differentiating between spinal cord ependymoma and spinal cord astrocytoma. Ependymoma child or adult more central in location bone remodelling is common low T1 signal well-defined enhancement syrinx is more common haemorrhage is more common Astrocyt...

Epidural angiolipoma

Epidural angiolipomas are rare benign tumours 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 ...

Epidural blood patch

Epidural blood patch is a treatment option for patients with craniospinal hypotension or post lumbar puncture headaches. The procedure can be done blind or under fluoroscopic or CT guidance, and is performed predominantly by radiologists and anaesthetists. Indications craniospinal hypotension...

Epidural lipomatosis

Epidural lipomatosis refers to an excessive accumulation of fat within the spinal epidural space resulting in compression of the thecal sac. In severe cases, compression may be symptomatic. The lumbar region is most frequently affected. Epidemiology The demographics of affected individuals ref...

Epitransverse process of the atlas

Epitransverse process is a rare anatomical variant of the atlas, consisting of a bony exostosis which extends cephalad from from the transverse process of the atlas to articulate with the occipital bone. This process sometimes meets with a paracondylar process, forming a pseudoarthrosis at the i...

Erector spinae group

The erector spinae group is the intermediate layer of the intrinsic muscles of the back. This group is made of three subgroups, with the group divisions occurring by location. The iliocostalis group occurs most laterally, followed by the longissimus group, and finally the spinalis as the most me...

Erector spinae muscles (mnemonic)

There are multiple handy mnemonics to recall the erector spinae muscles. They usually describe the position from lateral to medial. I Like Standing I Love Sex I Long for Spinach I Like Siri Mnemonic I: iliocostalis L: longissimus S: spinalis

Erosion of the odontoid process (differential)

Erosion of the odontoid peg can result from a number of pathological entities: inflammatory arthropathy rheumatoid arthritis: classic 1-2 systemic lupus erythematosus crystal arthropathy calcium pyrophosphate arthropathy (CPPD): relatively common gout non-inflammatory arthropathy: osteoar...

Extension teardrop fracture

Extension teardrop fracture typically occurs due to forced extension of the neck with resulting avulsion of the anteroinferior corner of the vertebral body. Extension teardrop fractures are stable in flexion and unstable in extension as the anterior longitudinal ligament is disrupted. Extension ...

Extrapulmonary tuberculosis

Extrapulmonary tuberculosis (TB) refers to the haematogenous spread of Mycobacterium tuberculosis. Pathology Extrapulmonary tubercuosis can occur as a primary form of the disease, i.e. direct infection of an extrapulmonary organ without the presence of primary pulmonary tuberculosis or it can ...

Extreme lateral interbody fusion (XLIF)

Extreme lateral interbody fusion (XLIF) is a form of lumbar surgical spinal fusion developed in 2001 to be a safer alternative to the older anterior lumbar interbody fusion (ALIF) developed in the 1950s 1,2. Unlike an ALIF, an XLIF is performed from a lateral trans-psoas approach and does not r...

Facet dislocation

Facet dislocation refers to anterior displacement of one vertebral body on another. Without a fracture, the only way anterior displacement can occur is by dislocation of the facets. Facet dislocation can occur to varying degrees: subluxed facets perched facets locked facets The injury usua...

Facet joint

The facet (or apophyseal or zygapophyseal) joints are the articulations of the posterior arch of the vertebrae and form part of the posterior column. Gross anatomy They are symmetrical synovial-lined joints that have a fibrous capsule and connect the articular facets of the vertebrae. The sup...

Facet joint capsule

Facet joint capsules are the fibrous capsule that surround the vertebral facet or zygapophyseal joints. They are particularly thin and loose, attached to the margins of articular facets on adjoining articular processes. The capsules merge medially with the ligamentum flavum. In the cervical re...

Facioscapulohumeral muscular dystrophy

Facioscapulohumeral muscular dystrophy (FSHD) is a form of muscular dystrophy characterised by extremely variable degrees of facial, scapular and lower limb muscle involvement. Epidemiology It is considered one of the more common hereditary muscular disorders with a prevalence of ~1 in 8,000. ...

Failed back syndrome

Failed back syndrome refers to persistent leg and/or lumbar back pain after a surgical procedure. The pathophysiology of this syndrome is complex, as often the operation was technically successful. Terminology Other names for failed back syndrome include failed back surgery syndrome, post-lam...

Fibrocartilaginous embolism

Fibrocartilaginous embolism (also known as nucleus pulposus embolism) is a rare cause of spinal cord ischaemia due to embolisation of nucleus pulposus material from intervertebral disc in a retrograde direction into a spinal artery or vein. Fibrocartilaginous embolism is a diagnosis of suspicio...

Fifth lumbar vertebra (L5)

The fifth lumbar vertebra (L5) is the largest of the five lumbar vertebrae and is considered an atypical vertebra due to its shape. Gross anatomy L5 is the largest, most inferior lumbar discovertebral unit in the vertebral column, and participates in forming the lumbar lordosis (from L1 to L5...

Filum terminale

The filum terminale is a filament of connective tissue that extends inferiorly from the apex of the conus medullaris. Gross anatomy The filum terminale is continuous with the pia mater and is described as having two sections: filum terminale internum: upper three quarters of the filum; covere...

Fish vertebra

Fish vertebra, also known as codfish vertebra, describes the biconcave appearance of vertebrae (especially lumbar vertebrae). Pathology Seen in: osteoporosis sickle cell disease hereditary spherocytosis homocystinuria renal osteodystrophy osteogenesis imperfecta thalassemia major (rare...

Flexion teardrop fracture

Flexion teardrop fractures represent a fracture pattern occurring in severe axial/flexion injury of the cervical spine. They are important to recognize because they indicate extensive underlying ligamentous injury and spinal instability. Associated spinal cord injury is common, especially anteri...

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...

Fluoroscopy guided lumbar puncture

Fluoroscopy-guided lumbar puncture (LP) is a minimally invasive, image-guided diagnostic and therapeutic procedure that involves the removal of a small volume of cerebrospinal fluid (CSF) from, or an injection of medication or other substance (e.g. radiotracer, chemotherapy agents) into the lumb...

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