Figure 11.

Illustrations demonstrating evolution hypothesis of pulmonary arteriovenous malformation (PAVM) on CT scan. First image shows isolated nodular or ill-defined ground-glass attenuation. It corresponds to the initial venous telangiectatic stage which is followed by the pulmonary venous enlargement, and corresponds to microscopic arteriovenous connections. In next stages, vascular branching is depicted on CT: the feeding artery (blue color vessel) lies within the ground-glass nodule, while draining veins (red color vessel) are visible in the periphery of the nodule. Final image demonstrates the development of a true PAVM.