Incidental Detection of Femoral Pseudoaneurysm at 18F-FDG PET/CT

Abstract

A 72-year-old man with history of lung cancer and melanoma was referred for routine follow-up with 18 F-FDG PET/CT. CT images showed a new mass in the right groin associated with mild FDG activity on 18 F-FDG PET images. Subsequent ultrasound obtained the same day demonstrated flow within the lesion to be a pseudoaneurysm of the right femoral artery.

Coexistence of FDG-Avid and FDG-Negative Aneurysms in a Patient With Fever of Unknown Origin

“…[2][3][4][5] Increased 18 F-FDG uptake within the pseudoaneurysms and asymptomatic aneurysm walls has also been reported. 6,7 Aneurysms can be caused by atherosclerosis, infection, trauma, and arterial wall disease, and iliac artery aneurysms are commonly associated with abdominal aortic aneurysm as aortoiliac aneurysms in approximately 10% of abdominal aortic aneurysm. 8 Inflammatory aortic aneurysm is a relatively rare variant of aneurysms, and the clinical presentation is usually nonspecific, making imaging particularly important.…”

“…18 F-FDG PET/CT has been proven to have high sensitivity and diagnostic accuracy for fever of unknown origin,1 and it is also used to detect some vascular inflammatory diseases, including inflammatory and fungal aortic aneurysms [2][3][4][5]. Increased 18 F-FDG uptake within the pseudoaneurysms and asymptomatic aneurysm walls has also been reported 6,7. Aneurysms can be caused by atherosclerosis, infection, trauma, and arterial wall disease, and iliac artery aneurysms are commonly associated with abdominal aortic aneurysm as aortoiliac aneurysms in approximately 10% of abdominal aortic aneurysm 8.…”