Items tagged “refs link”
12 results found
Dural venous sinuses
Dural venous sinuses are venous channels located intracranially between the two layers of the 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 va...
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: Resistive index (RI) = (peak systolic velocity - end-diastolic velocity)/peak systoli...
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...
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...
The endometrium refers to the inner lining of the uterine lumen, composed of endometrial glands surrounded by loose highly cellular connective tissue. Gross anatomy Layers In women of reproductive age, the endometrium is composed of two layers: stratum basale (basal layer): describes the de...
Sinus of Morgagni
The sinus of Morgagni is a defect in the anterior aspect of the pharyngobasilar fascia. It transmits the Eustachian tube and tensor veli palatini muscle and allows communication between the nasopharynx and middle ear. Terminology Not to be confused with the foramen of Morgagni, an anterior tho...
Aortic root dilatation
Aortic root dilatation refers to abnormal enlargement of the aortic root which may be focally aneurysmal or a more diffuse ectasia. Clinical presentation Aortic root dilatation is often completely asymptomatic and found incidentally 2. In rare instances, it may present with a catastrophic comp...
Fluorography is the use of relatively intense (50-1000mA), pulsed x-ray exposures (pulses are of short duration and applied at 1-12 pulses/second) to form an x-ray image. The resultant images have a relatively high signal to noise ratio (SNR), i.e the images are of better quality than those ac...
Walch classification of glenoid morphology
The Walch classification of glenoid morphology is the most commonly used system describing glenohumeral pathology in primary osteoarthritis. It was initially measured on 5 mm thick slices on axial CT scans of the shoulder 1, which had mixed results for inter- and intra-observer agreement but th...