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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.

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Endovascular clot retrieval (ECR)

Endovascular clot retrieval (ECR), also known as mechanical thrombectomy (MT) or endovascular thrombectomy (EVT), is increasingly performed in patients presenting with large vessel occlusion (LVO), especially those with a large ischemic penumbra that is likely to progress to ischemic stroke. To ...

Venous intravasation

Venous intravasation is the unintended introduction of radiographic contrast material into the local venous system. It is a well-recognized phenomenon during retrograde urethrograms 1,2 and hysterosalpingograms (HSG), although can occur with other invasive procedures in the vicinity of venous pl...

CT guided percutaneous drainage

CT guided percutaneous drainage is one form of image-guided drainage, allowing minimally invasive treatment of collections, potentially anywhere in the body. Although less commonly used than ultrasound guidance, it is particularly valuable in gaining access to deeper or more posterior parts of t...

Endovascular arteriovenous fistula creation

Endovascular arteriovenous fistula creation is a minimally invasive alternative for the creation of arteriovenous fistulae for haemodialysis access. Technique Catheter-based technology and image guidance in the form of ultrasound and fluoroscopy is utilized create a side-to-side anastomosis be...

Splenic artery embolization

Splenic artery embolization is an endovascular technique for treatment of splenic and splenic artery pathology as an alternative to splenic artery ligation or splenectomy. It often results in successfully treating the underlying pathology, while maintaining at least partial splenic function. I...

Hip joint injection (technique)

Hip joint injections can be performed with a variety of image guidance, including fluoroscopy and ultrasound, which are used to administer MRI arthrogram injectate, or a steroid containing anesthetic arthrogram injectate. Indications MRI: labral injury anesthetic pain/arthropathy, e.g. ost...

Glenohumeral arthrography

Glenohumeral (shoulder) arthrography is an imaging technique used to evaluate the glenohumeral joint to evaluate the joint components. A glenohumeral joint injection is usually performed under fluoroscopic guidance although ultrasound and CT can be also be used. An alternative to direct arthrogr...

MR arthrogram solution

MR arthrogram solution is a gadolinium-containing mixture injected into a joint for MR arthrography. Terminology Fluoroscopy, ultrasound or CT guidance can be used to cannulate a joint, which is then injected with the MR arthrogram solution. MR arthrogram solutions differ in different instit...

Flow-diverter stent

Flow-diverter stents are important devices in the management of intracranial aneurysms in both acute and elective settings, especially ones that are large, broad-necked, or fusiform. Complications Understanding the complication rates is important in obtaining informed consent from patients. In...

Pulmonary artery catheter

Pulmonary artery catheters (PAC or Swan-Ganz catheters) are balloon flotation catheters that are inserted into the pulmonary arteries. They can be inserted simply, quickly, with little training and without fluoroscopic guidance at the bedside, even in the seriously ill patient. Usage Historica...

Fractional flow reserve

Fractional flow reserve (FFR) is a technique to evaluate the hemodynamic relevance of coronary artery stenoses 1,2. It is defined as "the ratio of maximal flow achievable in the stenotic coronary artery to the maximal flow achievable in the same coronary artery if it was normal" 1. Fractional f...

Percutaneous renal biopsy

Percutaneous renal biopsy, utilizing either ultrasound or CT, allows for an accurate, reliable method of acquiring renal tissue for histopathological assessment. The biopsy may be of a native or transplant kidney. It is divided into two types: non-focal or non-targeted focal or targeted (i.e....

CT guided adrenal biopsy

CT guided adrenal biopsy is usually performed for the diagnosis of indeterminate adrenal nodules or tumors. This procedure has steadily declined in use since 1990s due to improvements in, and validation of, non-invasive CT and MR techniques that can now diagnose benign adrenal lesions with a hig...

Percutaneous cholecystostomy

Percutaneous cholecystostomy is the image-guided placement of a drainage catheter into the gallbladder lumen. This minimally invasive procedure can aid in patient stabilization in order to enable a more measured surgical approach with time for therapeutic planning. A 2018 study demonstrated no ...

Thoracic duct embolization

Thoracic duct embolization (TDE) is a safe, efficacious treatment for chylothorax 1. Chylothoraces with a low drain output (<1L/day) are traditionally managed conservatively with dietary change, whilst high output (>1L/d) are managed with surgical thoracic duct (TD) ligation 2. Thoracic duct em...

CT myelography

CT myelography (CTM) is a myelography technique used mainly to assess for potential spinal canal stenosis when MRI is contraindicated or when dynamic imaging is required. History CT myelography was first performed in 1976 2 and became the gold standard for imaging the spinal canal and cord unt...

Facet joint injection

Facet (zygapophyseal) joint injections are performed primarily for the diagnosis and differentiation of facet syndrome and radicular pain syndrome, and are one of the spinal interventional procedures. They can be performed under fluoroscopic, or CT image guidance, and cervical, thoracic or most ...

Sternoclavicular joint injection (technique)

Sternoclavicular joint (SCJ) injections under image guidance ensure precise delivery of an injectate into the joint and, importantly, that the needle is under direct visualization. Indications pain arthropathy, e.g. osteoarthritis diagnostic injection Contraindications Absolute anaphylaxi...

Fluoroscopic myelography

Fluoroscopic myelography is a technique that allows the visualization of the theca by the introduction of contrast medium into the CSF. This is usually accomplished by a lumbar puncture, or less commonly a suboccipital puncture. The patient can then be tilted and rotated to cause the contrast, ...

Subtalar joint injection (technique)

Subtalar joint injections are most often performed for osteoarthritis with injection into the posterior subtalar joint. Ultrasound, fluoroscopy and CT guidance can be used. Indications osteoarthritis diagnostic Contraindications Absolute anaphylaxis to contrast/injectates active local/sy...

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