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| __NOTOC__
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| {{Thromboembolism}}
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| {{CMG}}
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| ==Overview==
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| ==Other Imaging Findings==
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| ===Contrast Venography===
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| Contrast venography (also called '''Venography''' or '''phlebography''') is the definitive test for diagnosing [[deep venous thrombosis]] which taken after a special dye is injected into the vein or even bone marrow.
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| Contrast venography can also help;
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| * to distinguish blood clots from obstructions in the veins
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| * to evaluate congenital vein problems
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| * to evaluate veins prior to treatment of chronic venous insufficiency
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| * to control functioning of deep leg vein valves
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| * to identify a vein graft for coronary artery bypass surgery
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| <gallery>
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| Image:DVT 1.jpg|Venography: Deep venous thrombosis. [http://www.lakeridgehealth.on.ca Source]
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| Image:Venous thrombosis with collateral.jpg|An occluded vein with collateral vessel formation. [http://www.lakeridgehealth.on.ca Source]
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| </gallery>
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| ===Pulmonary Angiography===
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| '''Pulmonary angiography''' (or '''pulmonary arteriography''') is a [[cardiology|cardiological]] [[medicine|medical]] procedure. Pulmonary arteries are visualized to detect [[blood clot]]s (such as a [[pulmonary embolism]]) or [[arteriovenous malformation]]s.
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| The use of pulmonary angiography has been largely replaced by spiral CT in diagnosis of [[pulmonary embolism]].
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| <gallery>
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| Image:Pe on pulmonary angiography.jpg|Pulmonary angiogram in a patient with [[pulmonary embolus]]. A thrombus is observed in the area within the yellow circle. [http://www.e-radiography.net Source]
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| </gallery>
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| ===Ventilation / Perfusion Scan===
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| ''[[Ventilation/perfusion scan]]'' (or ''V/Q scan'' or ''lung [[scintigraphy]]''), which shows that some areas of the lung are being ventilated but not perfused with blood (due to obstruction by a clot). This type of examination is used less often because of the more widespread availability of CT technology, however, it may be useful in patients who have an allergy to [[iodinated contrast]] or in [[pregnancy]] due to lower radiation exposure than CT. * The ventilation/perfusion ratio (V/Q) Scan: The PIOPED data suggests that normal perfusion scans are almost never associated with recurrent pulmonary embolism, even if anticoagulation is withheld.
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| ==References==
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| {{Reflist|2}}
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