镜下见心包的表面沉积的淡红纤维素向外延伸。并有炎症存在。纤维素可以被机化、吸收，也会粘连在一起。
Microscopically, the pericardial surface here shows strands of pink fibrin extending outward. There is underlying inflammation. Eventually, the fibrin can be organized and cleared, though sometimes adhesions may remain.