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CT Angiography; Narrowing or occlusion of mesenteric vessels, bowel wall thickening, pneumatosis intestinalis

Duplex Ultrasound; Demonstrates patency and flow within the graft, may show stenosis or occlusion

Catheter Angiography, CT, or MR Angiography; Vessel wall thickening, luminal narrowing, occlusions and aneurysms in affected vessels

CT Angiography; Intimal flap separating true from false lumen, possible involvement of branch vessels

MRI Angiography; Tangle of abnormal vessels, flow voids on T2-weighted imaging, enlarged feeding arteries and draining veins

Duplex Ultrasound or MRA; Reversed flow in the vertebral artery, stenosis or occlusion of subclavian artery before the vertebral takeoff

Ultrasound; Noncompressible vein with echogenic thrombus

Ultrasound; Dilated, tortuous subcutaneous veins with incompetent valves

CT Venography or MR Venography; Compression of left common iliac vein by right common iliac artery, collateral venous formation

Ultrasound with Doppler; Dilated portal vein >13 mm, portosystemic collaterals, slow or reversed portal venous flow

CT Pulmonary Angiography; Filling defect in pulmonary artery, right heart strain

CT or MR Angiography; Multiple telangiectasias and arteriovenous malformations, potential for GI bleeding and epistaxis

Arterial Duplex Ultrasound; Absence of blood flow in affected arteries, acute thrombus formation

CT Angiography; Enlarged aorta with possible mural thrombus

Duplex Ultrasound; Increased peak systolic velocity at renal artery, tardus-parvus waveform in segmental arteries

Ultrasound; Incompetent venous valves, venous reflux, venous dilation

Lymphoscintigraphy; Delayed or absent lymphatic transport, dermal backflow, collateral lymphatic channels

Ultrasound with Doppler; Hepatic vein obstruction, hepatomegaly, ascites

CT Angiography or MR Angiography; Outpouching of a cerebral artery, possible adjacent subarachnoid hemorrhage if ruptured

Catheter Angiography; Beads-on-a-string appearance in medium-sized arteries, arterial stenosis and aneurysm

MRI or MRA; Abnormal course or compression of the popliteal artery, potentially with post-stenotic dilatation

MR Angiography or PET-CT; Vessel wall thickening, stenosis or occlusion of large arteries, increased positron emission in walls of inflamed vessels

Lower Extremity Arterial Doppler; Reduced or absent flow in the affected limb arteries

CT Angiography or MR Angiography; Abnormal dilation of the thoracic aorta, potential mural thrombus or calcification