渗出液中蛋白质含量较高，会导致体腔积液。如果以纤维素为主，会导致粘膜表面的纤维素性炎症。图示纤维素性心包炎，在心包脏层和壁层之间可见白色绒毛状的纤维素。
Exudation of a protein-rich fluid into a cavity leads to a transudate. The fibrin in this fluid can form a fibrinous exudate on the surfaces. Here, the pericardial cavity has been opened to reveal a fibrinous pericarditis with strands of stringy pale fibrin between visceral and parietal pericardium.