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Figure 6 Postoperative Pulmonary Vein Obstruction With Collateral Drainage to the Unobstructed Ipsilateral Pulmonary Vein in a 6-Year-Old Boy
Contrast-enhanced magnetic resonance angiograms, reformatted in slanted coronal planes, reveal complete occlusion of the left upper (LUPV) and left lower (LLPV) pulmonary veins. (A) The left middle pulmonary vein (LMPV) has an unobstructed connection to the left atrium (LA). (B) Collateral channels (arrows) are seen between the peripheral branches of the unobstructed LMPV and the branches of the obstructed LUPVs and LLPVs. Ao = aorta; RA = right atrium; RLPV = right lower pulmonary vein; RPA = right pulmonary artery.
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