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Case with vascular score 3. (A) Complex mesh-like vascular framework of 1.7 cm of diameter with no or minimal residual alveolar spaces (area within lines), panoramic view. (B) CD34 staining, panoramic view. (C) Mesh-like framework capillaries replacing normal lung. Detail of area within lines is shown (A). (D) CD34 staining. (E) Dual staining for CD34/CK18 with scarce epithelial cells in residual small-size alveolar spaces.
