Predicting Endoleaks Following Endovascular Aortic Aneurysm Repair Using 18F-Sodium Fluoride

Inclusion Criteria: * A diagnosis of AAA as defined by the European Society of Vascular Surgery guidelines on the management of aorto-iliac artery aneurysms, and having undergone endovascular repair within the recommended Instructions For Use (IFU) by the manufacturer. \['Endoleak' and 'No Endoleak groups only\] * Complication will be defined as any type of endoleak or stent graft migration \['Endoleak' group only\]. * A diagnosis of AAA requiring endovascular repair OR a diagnosis of juxtarenal AAA requiring fenestrated endovascular aneurysm repair as defined by the European Society of Vascular surgery guidelines on the management of aorto-iliac artery aneurysms and planned EVAR or fenestrated EVAR surgery. \['pre-EVAR' group only\] * Minimum age: 50 years. No maximum age. * Retain capacity for informed consent Exclusion Criteria: * The inability of patients to undergo PET/CT scanning * Chronic kidney disease (eGFR ≤ 30 mL/min/1.73 m2) * Major or untreated cancer * Pregnancy * Allergy or contra-indication to iodinated contrast * Inability or unwillingness to give informed consent * Life-expectancy of less than two years * Known history of connective tissue disease