Peracute is used to denote inflammatory reactions manifested in full force after only a few hours and associated with severe injury to tissue. There has not been time for fibrosis to occur. Characterized by persistence of the inflammatory stimulus for periods usually beyond 10-14 days and characterized in most instances by fibrosis. Fibrosis is the accumulation of synthesized collagen in tissue. In central nervous tissue, marked glial cell proliferation is one indicator of a chronic inflammatory reaction since fibrosis does not occur.
Exudate is primarily protein-containing fluid with a relatively low content of inflammatory cells.
Marked by the accumulation of fibrin- dominated exudate. Associated with marked increase in vascular permeability. Commonly associated with mucosal and serosal membranes. Lumens may contain casts of fibrin. In chronic reactions, fibrous connective tissue may attach to the fibrinous exudate.