How are fibrinous inflammations?

Large vascular leaks or local procoagulant stimulus. Fibrinogen passes through endothelia and fibrin clots are formed in extracellular space. Usually of lining body cavities (meninges, pericardium and pleura) Histology: eosinophilic threads or amorphous coagulum They are dissolved by fibrinlysis of macrophages, if not removed leads to scarring and ingrowth of fibroblasts and may cause obliteration of pericardial space