CT
Axial C+ arterial phase
Coronal C+ arterial phase
Axial C+ portal venous phase
There is a large left atrial appendage aneurysm with swirling contrast inside. The aneurysm measures 9 x 7 x 13 cm (AP x T X CC) and diameter of its neck is 2 cm (nicely seen on coronal images).
The anterior aspect of the lesion shows homogeneous contrast filling on the portal phase, apart from a small area in the dependent anterior aspect, which represents a thrombus.