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Histological cross-sections with trichrome staining through four sets of human right pulmonary veins. In contrast to figure 3, there is no sleeve surrounding the inferior vena from the venoatrial junction to 10 mm. Note the incomplete encirclement of the sleeve at the level of the right superior pulmonary vein (arrows). RI, right inferior pulmonary vein; RS, right superior pulmonary vein.
