Review ArticleSaccular Kommerell aneurysm, a potential pitfall on MDCT imaging - A review of imaging features and potential mimics

•Kommerell aneurysm is an outpouching from a kommerell diverticulum.•Mimics include saccular aneurysm of the thoracic aorta, ductus diverticulum and dilated Kommerell diverticulum.•Kommerell aneurysm has the tendency to rupture, therefore, accurate diagnosis is critical.

Saccular Kommerell aneurysm represents a potential pitfall on Multidetector CT (MDCT) imaging, mimicking conditions such as saccular aneurysm of the thoracic aorta, ductus diverticulum and dilated Kommerell diverticulum. Accurate diagnosis of this condition is critical in the management of this potentially fatal condition. This paper reviews the MDCT imaging features of Kommerell aneurysms and its mimics and demonstrates how to make an accurate diagnosis through a series of four cases. MDCT features of Kommerell aneurysms, either saccular or fusiform types arising from a Kommerell diverticulum with atherosclerotic plaque and mural thrombus are discussed.