Fig. 17

Pulmonary arteriovenous malformation. a Conceptual illustration of simple versus complex arteriovenous malformation. Axial (b, c) and coronal (d) contrast-enhanced CT images demonstrate a large arteriovenous malformation of the left upper lobe (arrowhead) with a clearly identifiable feeding pulmonary artery (solid arrow) and draining pulmonary vein (dotted arrow). e Axial contrast-enhanced CT images of the same patient in lung windows reinforces the importance of fully evaluating the entire lungs as additional smaller AVMs (circle) were also identified in this patient leading to the diagnosis of hereditary haemorrhagic telangiectasia