|Metabolic activity (FDG uptake)|
|Intensity (SUVmax∗/SUV ratio†)||Mild grade||Intense|
|Location||Prosthetic valve||Aortic valved graft||Prosthetic valve||Aortic valved graft|
|Valve sutures||Tube sutures uptake > peritube uptake|
Sites with adhesive material
|Valve sutures with periprosthetic extension||Tube and peritube uptake > sutures uptake|
|Anatomic changes (CTA findings)|
|Prosthetic valve||Aortic valved graft||Leaflet thickening/vegetations‡|
|No abnormal findings||Minimal or no soft tissue reaction|
Post-surgical collections (seroma/hematoma)
CTA = computed tomography angiography; FDG = fluorodeoxyglucose; SUV = standardized uptake value.
↵∗ Maximum standardized uptake value.
↵† Prosthesis-to-background (hepatic or blood pool) SUV ratio.
↵‡ Soft-tissue lesions attached to valves.
↵§ Saccular enlargement of a vascular structure or contrast-filled soft tissue cavitation arising from the structure.
↵‖ Abnormal contrast-filled tract or communication between vascular structures.
↵¶ Extraluminal, non–contrast-filled soft tissue lesion around the tube or valve.
↵# Low-attenuation collection with enhancing wall.