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Open lung biopsies with H&E and CD31 staining of patient 1 (A and B) age 4 months and patient 3 (C and D) age 5 weeks. Typical features of ACD are seen in both patients, but are much milder in patient 1. The atypical finding of double-layered capillaries is noted with green double arrows. Abbreviations: alveolus (Al), arteriole (Ar), bronchiole (Br), and vein (Ve).
