gray infiltration

gray in·fil·tra·tion

a term sometimes used for the relatively rapidly formed, semisolid, gray or gray-white exudate (chiefly necrotic cells and remnants of tissue, and macrophages) resulting from unusually acute, overwhelming, diffuse tuberculous infection in the lung.
The transformation of pulmonary parenchyma into a grayish semisolid mucoid goo, typical of rapidly spreading acute necrotizing tuberculous pneumonia