Items tagged “refs link”
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Dural venous sinuses
Dural venous sinuses are venous channels located intracranially between the two layers of dura mater (endosteal layer and meningeal layer). They can be conceptualised as trapped epidural veins. Unlike other veins in the body they run alone, not parallel to arteries. Furthermore, they are valvele...
Reid index is a pathological measurement of mucosal gland proliferation in chronic bronchitis. It is assessed by comparing the thickness of the mucous glandular tissue versus the distance from epithelium to the level of cartilage. An index of < 0.4 is considered to be within normal limits.
Hepatic arterial resistive index
The resistive index (RI) is the commonest Doppler parameter used for hepatic arterial evaluation. The usual range in normal, as well as post-transplant individuals, is between 0.55 and 0.8. It is measured by: RI = (peak systolic velocity - end diastolic velocity)/peak systolic velocity Hepati...
Pediatric cardiovascular procedures
A number of pediatric cardiovascular procedures are encountered when reporting pediatric imaging. They include: Blalock-Taussig (BT) shunt classic: end to side subclavian to ipsilateral pulmonary arterial anastomosis modified: graft anastomosis Waterston shunt Sano shunt: right ventricle to...
Disappearing basal ganglia sign
The disappearing basal ganglia sign is one of the early signs of a middle cerebral artery (MCA) infarction. It is defined as the loss of delineation of the basal ganglia, due to blurring of their grey-white matter interface and hypoattenuation, consequent to cytotoxic edema at the time of an isc...
Thymic rebound hyperplasia
Thymic rebound hyperplasia is considered a from of true thymic hyperplasia. Pathology In periods of bodily stress the thymus may acutely shrink to 40% of its original volume (depending on the severity and duration of the stress). During the recovery phase it can grow back to its original size ...
Eggshell calcification (breast)
Eggshell calcifications in the breast are benign peripheral rim like calcifications Pathology They are typically secondary to fat necrosis or calcification of oil cysts. Radiographic features thin rim-like calcification (<1 mm in thickness) lucent centers small to several centimeters in di...
Isolated greater trochanteric fracture
Greater trochanteric fractures generally result from forceful muscle contraction of a fixed limb, which usually occurs in those who are young and physically active. It can also be caused by direct trauma. Epidemiology Generally, isolated trochanteric fractures are seen more so in young, active...
Aortic root dilatation
Aortic root dilatation refers to abnormal enlargement of the aortic root. This is occur in form of an aneurysm or as more diffuse ectasia. Pathology It can occur from varied pathology. Conditions associated with aortic root dilatation include Marfan syndrome bicuspid aortic valve vascular E...