Predominant constituent of Hyaline membrane disease is :: (A) Albumin, (B) Anthracotic pigment, (C) Fibrin rich exudates, (D) Phosphatidylcholine
Answer is C. The membranes (in hyaline membrane disease) are largely made up of fibrinogen and fibrin admixed with cell debris derived chiefly from necrotic type-II pneumocytes. There is a remarkable paucity of neutrophilic inflammatory reaction associated with these membranes.