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A. Hyaline membrane (green asterisk, x400). B. Type II pneumocyte proliferation and alveolar desquamation (x400). C. Microthrombi (blue arrows, x200). D. Microthrombi (blue arrows), type II pneumocyte proliferation, atypical type II pneumocyte (orange arrow), and alveolar desquamation (x400).
ARDS: acute respiratory distress syndrome.
