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CTPA in CTEPH. (a) Web across the right lower lobe pulmonary artery trifurcation (red circle) and occlusion of the anterior segment of the left lower lobe (red arrow). (b) Occlusive disease with only attenuated “ghost vessels” of the anterior and lateral segments of the right lower lobe (red arrows) with patent medial and posterior segments. In the left lower lobe, there is occlusive disease of the anterior and posterior segments (dotted arrows) with a patent lateral segment.
