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Photomicrographs of HE-stained rat lungs using 400X magnification. (A) C-MV (control, mechanical ventilation) exhibits dilated and congested alveolar septa (arrows); (B) HCl group shows macrophages (arrow) and erythrocytes inside alveolus (asterisk); (C) HCl+PTX group exhibits some inflammatory infiltration, numerous macrophages, neutrophils (arrows) and red blood cells; (D) PTX+HCl group, showing mild alveolar edema and few macrophages in the alveolar lumen (arrow).
