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Figure 16b. Suspicion of a right upper lobe pulmonary AVM in a 60-year-old man. (a) Three-dimensional SSD (inferosuperior view, threshold of +150 HU) and (b) vertical MIP image, both generated from the same focal spiral CT angiogram (2-mm collimation, pitch of 1.5, 24% iodinated contrast agent), show the abnormal route of a right upper lobe pulmonary vein (arrows in a, • in b), mimicking a pulmonary AVM. (c) The venous phase of the hyperselective right upper lobe angiogram (frontal view) confirms the abnormal route of the right upper lobe pulmonary vein (arrows) without abnormal connection (the arrowhead points to the tip of the catheter).