Predominant constituent of Hyaline membrane is:: (A) Albumi, (B) Anthracotic pigment, (C) Fibrin rich exudates, (D) None of the above
Answer is C. The membranes are largely made up of fibrinogen and fibrin admixed with cell debris derived cheifly from necrotic type-II pnemocytes. There is a remarkable paucity of neutrophils inflammatory reaction associated with these mambranes. The lesions of hyaline membrane disease are never seen in still born infants or in live-born infants who die within a few hours of bih.(ref Robbins 9/e p457)