Items tagged “rewrite”

148 results found
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Cholescintigraphy

Cholescintigraphy is the use of radiotracers to assess the anatomy and function of the biliary system (and the liver indirectly). Currently, this is most commonly performed with Tc-99m-IDA analogs 1, and "hepatic IDA" imaging gave rise to the more common term "HIDA scan." Indications Cholescin...
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Nerve injury classification (MRI)

Nerve injury classification describes the various features of nerve injury on MRI with respect to pathological events. Classification neuropraxia grade I: there is increased T2/STIR signal in the nerve, however, the muscle appears normal recovery occurs within a few days to 3 months axono...
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Side lobe artifact

Side lobe artifacts occur where side lobes reflect sound from a strong reflector that is outside of the central beam, and where the echoes are displayed as if they originated from within the central beam. Ultrasound transducer crystals expand and contract to produce primary ultrasound beams in ...
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Delayed nephrogram

A delayed nephrogram, commonly described on plain film urography, but also visible on CT urography, is when there is absence or reduction of the normal renal parenchymal enhancement on the nephrographic phase images. Terminology A delayed nephrogram is characteristically unilateral and is usua...
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Diffuse T1 bone marrow signal loss

Diffuse T1 vertebral bone marrow signal loss is associated with replacement of fatty marrow by edema or cellular tissue.  Radiographic features MRI T1-weighted imaging without fat suppression is one of the most important sequences for distinguishing between normal and abnormal bone marrow. Ab...
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Stellate ganglion

The stellate ganglion (plural: ganglia), also known as the cervicothoracic ganglion, is formed by the inferior cervical and first thoracic ganglia and is located just anterior to the head of the first rib. It receives input from the paravertebral sympathetic chain and provides sympathetic effere...
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Synovial enhancement

Synovial enhancement is an imaging feature typically observed on MRI imaging. It can occur in various forms and can be focal or diffuse. Pathology inflammatory synovitis transient synovitis of the hip infective synovitis inflammatory arthritides septic arthritis tuberculous septic arthri...
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Hartmann pouch

​Hartmann pouches​ are a technique in colonic surgery. After a segment of colon is resected, there are generally two options with regards to what to do with the two ends of the colon: both the upstream end of the colon (the end of the colon through which fecal contents would pass) and the downs...
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Spinal stenosis

Spinal stenosis is a condition in which a portion of the spinal canal narrows to the point at which it can exert pressure on the nerves that travel through the spine. Spinal stenosis is not to be confused with foraminal stenosis, which is the narrowing of the foramina with subsequent compressio...
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Causes of cone-shaped epiphysis (mnemonic)

A useful mnemonic for remembering the causes of cone-shaped epiphysis is: ABCDE MOST Mnemonic A: achondroplasia, acrodysostosis B: Beckwith-Wiedemann syndrome C: chondroplasia punctata, Cockayne syndrome, conorenal syndrome, cleidocranial dysplasia, cartilage-hair hypoplasia D: dactylitis,...
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Radionuclide cisternography

Radionuclide cisternography is a nuclear medicine imaging technique that uses intrathecal 111In-DTPA (diethyletriaminepentaacetic acid; pentetate) to visualize the flow of cerebrospinal fluid (CSF). There are a few indications 1: localization of CSF leaks, such as in CSF rhinorrhea and CSF oto...
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Perianal disease

Perianal disease, also known as anorectal disease, is the collective name given to a group of diseases that primarily affect the anal canal +/- rectum. The disease spectrum ranges from the typically benign, e.g. hemorrhoids, to the potentially more serious, e.g. perianal fistula 1-3. hemorrhoid...
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Abusive head trauma

Abusive head trauma is a term that is used for inflicted head injury that has occurred by either shaking, impact head trauma, or both, as part of the spectrum of non-accidental injury (NAI). Pathology Intracranial injuries Subdural hemorrhage in a child should be viewed with suspicion. Most o...
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Haemodialysis vascular access

Vascular access for haemodialysis is used for end-stage renal failure that requires renal replacement therapy. Options include temporary/permanent and non-surgical vs surgical methods. This article will focus on surgical arteriovenous fistulae. Types of vascular access Temporary temporary vas...
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Harris classification of acetabular fractures

The Harris classification of acetabular fractures is based on definitions of acetabular walls and columns that differ from the Judet and Letournel classification 1. Usage The Judet and Letournel classification is more widely used and is applicable to both CT and plain radiographs, whereas, the...
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Foot injection (disambiguation)

Foot injection is a non-specific term often used by patients, about tarsal or metatarsal joint injections and to other procedures which include:​ calcaneocuboid joint injection metatarsophalangeal joint (MTPJ) injection naviculocuneiform joint injection plantar fascia injection plantar fasc...
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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...
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Medial collateral ligament bursa

The medial collateral ligament bursa is one of the bursae of the knee with the shape of a vertically expanding compartment located between the superficial and deep portions of the medial collateral ligament 1-5. The bursa is usually located in the middle third of the knee, with the anterior marg...
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Pancreatic acinar cell carcinoma

Pancreatic acinar cell carcinomas are rare exocrine neoplasms that comprise ~1% of all pancreatic tumors. This tumor shows more aggressive behavior than the far more common adenocarcinoma 1,3,4. Epidemiology This tumor is most common in pediatric (8-15 years) and adult (60 years) populations. ...
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Focal cerebral arteriopathy of childhood

Focal cerebral arteriopathy of childhood (FCA), also known as transient cerebral arteriopathy (TCA), is characteristically an acute monophasic disease, with unilateral stenosis of the distal internal carotid artery and/or the proximal middle/anterior cerebral arteries, causing infarction in the ...