Items tagged “rewrite”

149 results found
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Sildenafil citrate-induced penile Doppler

Sildenafil citrate-induced penile Doppler is a technique for evaluating erectile dysfunction. It has greater patient acceptability than the usual papaverine-induced color Doppler and is safer. Sildenafil citrate is a popular vasodilator drug used in treatment of erectile dysfunction and can ach...
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Acrodysostosis

Acrodysostosis is a rare skeletal dysplasia characterized by growth restriction, nasal hypoplasia, brachydactyly, midfacial deficiency, intellectual disability and deafness. Clinical presentation The cardinal clinical features include, short hands with stubby fingers and similarly affected fee...
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Terminal zones of myelination

The terminal zones of myelination are located at the posterior aspect of the lateral ventricles (the peritrigonal regions) and are the only part of the cerebral white matter that may exhibit high T2 signal in a normal brain at 2 years of age, when myelination of cerebral white matter normally be...
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Pulmonary mucormycosis

Pulmonary mucormycosis is an opportunistic pulmonary fungal infection from a fungus belonging to the order Mucorales. Pulmonary mucormycosis has to be distinguished from the related counterpart invasive pulmonary aspergillosis (IPA) as modern first-line antifungals typically used for aspergillo...
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Revised Atlanta classification of acute pancreatitis

The Revised Atlanta classification of acute pancreatitis from 2012 is an international multidisciplinary classification of the severity of acute pancreatitis, updating the 1992 Atlanta classification. The worldwide consensus aims for an internationally agreed-upon classification of acute pancre...
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Radioembolization

Radioembolization is the delivery of radioactive microspheres to cancers using an endovascular approach. It is often performed as an outpatient procedure.  Indications hepatocellular carcinoma 2 hepatic metastases from colorectal carcinoma Contraindications Absolute contraindications exces...
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Optic neuropathy

Optic neuropathy is a broad term and can result from a variety of causes. Pathology genetic Leber hereditary optic neuropathy compression or trauma (traumatic optic neuropathy) optic nerve sheath meningioma progressive diaphyseal dysplasia thyroid-associated orbitopathy shear injury sku...
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ISSVA classification of vascular anomalies

The ISSVA classification of vascular anomalies encompasses all vascular malformations and tumors in a framework of internationally consistent nomenclature. Usage It is one of the two most widely used classification systems, the other being the Hamburg classification system of vascular malform...
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Focal areas of signal intensity (brain)

Focal areas of signal intensity (FASI), also known as focal abnormal signal intensity or unidentified bright objects (UBO), are bright areas on T2-weighted images commonly identified in the basal ganglia (often the globus pallidus), thalamus, brainstem (pons), cerebellum, and subcortical white m...
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Bone mineral density

Bone mineral density (BMD) is defined as the amount of mineral (calcium hydroxyapatite) per unit of bone and can be used as an indirect indicator of bone strength. The bone mineral density is used to determine if osteopenia or osteoporosis are present. Radiographic features Bone mineral densit...
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Flare phenomenon (bone scintigraphy)

Flare phenomenon or osteoblastic flare phenomenon refers to interval visualization of lesions with a sclerotic rim around an initially lytic lesion or sclerosis of lesions previously undetected on radiograph or CT in the setting of follow-up of an oncological patient with other signs of partial ...
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Non-Hodgkin lymphoma

Non-Hodgkin lymphoma (NHL) is a neoplasm of the lymphoid tissues originating from B cell precursors, mature B cells, T cell precursors, and mature T cells. It includes all types of lymphomas apart from Hodgkin lymphoma. See the WHO classification of haematolymphoid tumors for further informatio...
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Sports injuries - cricket

Cricket is a popular game in Commonwealth countries. Sports injuries in this game can be associated with three positional aspects of the game: bowling, batting or fielding. Radiologists should know the different kinds of injuries related to this game for a better clinical association. Injuries c...
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Hip hemiarthroplasty

Hip hemiarthroplasty is an orthopedic procedure for the treatment of certain femoral neck fractures where the femoral head is removed and replaced. The prefix hemi (meaning half) refers to the fact that the prosthetic femoral head articulates with the native acetabulum. Indications Hemiarthrop...
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Missing IUCD

A missing IUCD is considered when the retrieval strings of certain types of intrauterine contraception devices (IUCD) cannot be seen on physical examination. The possibilities are expulsion of IUCD migration of IUCD detachment of IUCD thread uterine perforation in IUCD embedded IUCD Radiog...
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Pseudoenhancement

Pseudoenhancement is an artifact encountered with contrast-enhanced CT, whereby the calculated density of a lesion is inaccurately increased. This phenomenon is most often problematic during evaluation of renal cysts by CT. On CT, it can be challenging to distinguish cystic versus solid renal l...
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Orbital inflammatory disease (differential)

The differential diagnosis of orbital inflammatory diseases (including orbital pseudotumors) can be divided based on their location into: dacryoadenitis of lacrimal glands myositis of extraocular muscles optic perineuritis orbital cellulitis preseptal postseptal orbital apicitis Tolosa-H...
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Small pulmonary nodules (HRCT chest approach)

Small pulmonary lung nodules refer to an HRCT chest imaging descriptor for 5-10 mm lung nodules and are divided into three main categories based on their distribution pattern: centrilobular perilymphatic random Terminology Radiologists often informally refer to indeterminate small pulmonary...
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Effect of isolated pronation-supination (lateral wrist radiograph)

The wrist series is comprised of a posteroanterior, oblique, and lateral projection. The series examines the carpal bones (namely, the scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate and hamate). It also examines the radiocarpal joint along with the distal radius and ulna....
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Flip angle

The flip angle is an MRI phenomenon by which the axis of the hydrogen proton shifts from its longitudinal plane (static magnetic field B0) Z axis to its transverse plane XY axis by excitation with the help of radiofrequency (RF) pulses. A RF pulse is sent in at the precise Larmor frequency in re...