Items tagged “stub”
1,311 results found
Article
Short stem hip arthroplasty
Short stem hip arthroplasties are a special type of hip joint replacement where as the name states the femoral stem is shorter than usual. It is known by various trade names including the NANOS system. In selected patients it is thought to result in fewer complication rates 1.
Article
Exposure
The term exposure refers to the concentration, in air, of x-rays at a specific point and is the ionization produced in a specific volume of air: E = Q / m where E is exposure, Q is the quantity of charge on the ions and m is the unit mass of air.
Exposure describes the ability of x-ray photons ...
Article
Roentgen (unit)
The roentgen (symbol R) or röntgen (in German) is a legacy unit to measure radiation exposure. It was defined as the quantity of x-rays that produce 2.580 × 10-4 coulombs of charge collected per unit mass (kilograms) of air at standard temperature and pressure (STP): 1 R = 0.000258 coulombs per ...
Article
Plagiocephaly
Plagiocephaly refers to a type of craniosynostosis in which there is asymmetric premature closure of the coronal and/or lambdoid sutures. It can either involve single or asymmetric multiple sutures. Premature coronal suture closure is associated with the Harlequin eye deformity.
History and ety...
Article
Fascicular sign
The fascicular sign is a finding on T2-weighted MRI images that suggests a lesion of neurogenic origin. It is characterized by multiple small ring-like structures with peripheral hyperintensity representing the fascicular bundles within the nerves.
It is found in various neurogenic tumors, incl...
Article
Red marrow depletion (differential)
Complete fatty replacement of red marrow with fat on MRI can occur in a number of situations which includes:
aplastic anemia
chemotherapy
regional radiation therapy
See also
bone marrow
Article
Corona radiata
The corona radiata refer to a pair of white matter tracts seen at the level of the lateral ventricles. Superiorly they are continuous with the centrum semiovale. Inferiorly these tracts converge as the internal capsule.
Article
Subpleural line
Subpleural lines (also known as pleural lines) refers to thin curvilinear opacities, 1-3 mm in thickness, lying less than 1 cm from and parallel to the pleural surface.
Etiology
dependant atelectasis of normal lung if seen in the dependent posteroinferior portion of the lung of a patient in th...
Article
Pulmonary edema with acute asthma
Pulmonary edema with acute asthma is a rare non-cardiogenic cause of pulmonary edema.
Pathology
The air trapping which occurs in asthma results in a positive intra-alveolar pressure, thus decreasing the hydrostatic pressure gradient and may explain propensity for edema. The process may be asso...
Article
Post lung volume reduction pulmonary edema
Post lung volume reduction pulmonary edema is a type of non cardiogenic pulmonary edema that can occur following lung volume reduction or a lung resection such as lobectomy or pneumonectomy.
Epidemiology
It has been reported to occur in ~ 5% of right pneumonectomies, ~4% of left pneumonectomi...
Article
Spontaneous splenorenal shunt
A spontaneous splenorenal shunt (or simply splenorenal shunt) refers to an abnormal collateral portosystemic communication between the splenic vein and the left renal vein. It is one of the features of portal hypertension.
See also
portosystemic shunts
surgical splenorenal shunt
Article
Pulsatile portal venous flow
A pulsatile portal venous flow pattern is an abnormal form of portal venous flow and can result from both physiological and pathological causes.
In well subjects mild pulsatility, or in rare situations, even marked pulsatility has been described, particularly in thin subjects, with a venous pul...
Article
Porocarcinoma
Porocarcinoma (or eccrine porocarcinoma) is a rare type of malignant eccrine sweat gland tumor, more frequently encountered in the lower extremities (feet and legs). It arises from the intraepidermal portion of eccrine sweat glands or acrosyringium.
It represents 0.005-0.01% of all cutaneous tu...
Article
Frostberg inverted 3 sign
Frostberg inverted 3 sign is a radiological sign seen on a barium examination where there is effacement and distortion of the mucosal pattern on the medial wall of the second part of the duodenum due to focal mass and local edema. It is most commonly associated with carcinoma of the head of the ...
Article
Bronchial fracture (mnemonic)
A mnemonic for the features of a bronchial fracture on a chest radiograph is:
Ps (or written as PPP or PPPP)
Mnemonic
Ps: progressive or persistent pneumothorax or pneumomediastinum
Article
Choroidal fissure
The choroidal fissure, or choroid fissure, is a cleft of the medial surface of the cerebral hemisphere running immediately above the hippocampus and extends around the thalamus to the interventricular foramen of Monroe. It forms the medial wall of the lateral ventricle and attachment site for th...
Article
Falciform ligament sign
The falciform ligament sign, also called the Silver sign, is characterized by the falciform ligament being outlined with free abdominal gas in cases of pneumoperitoneum of a large amount.
It is almost never seen in isolation as, if there is enough free gas to outline the falciform ligament, th...
Article
Emphysematous osteomyelitis
Emphysematous osteomyelitis is an extremely rare form of osteomyelitis which is complicated by infection with gas-forming organisms. Only a handful of cases are published in the literature.
Pathology
Commonly reported organisms include 1
Fusobacterium necrophorum
Escherichia coli 4
Bacter...
Article
Anterior sacral meningocele
Anterior sacral meningocele is a congenital defect seen in the anterior aspect of the spine. It is defined as a meningeal cyst that occurs in the presacral space secondary to agenesis of a portion of the anterior sacrum.
Pathology
Associations
In approximately 50% of cases, associated malform...
Article
Idiopathic pauci immune pulmonary capillaritis
Idiopathic pauci immune pulmonary capillaritis (IPIPC) is considered a rare type of pulmonary vasculitis. Some authors consider this due be an organ specific subset of microscopic polyangiitis 3. It can result in diffuse alveolar hemorrhage.
Pathology
It is an isolated small vessel vasculitis ...
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