Benign Effusions



Serous cavities of the body – the peritoneal cavity, the pericardial cavity and the two pleural cavities – are closed spaces covered by the parietal and visceral layers of serous membranes. Under physiologic conditions, the two layers of the serous membranes are in close apposition, and only a small amount of fluid is present within the cavities, acting as a lubricant between the parietal and visceral layers to prevent friction. Accumulation of fluid in the serous cavities is called “effusion”. Any serous effusion is considered to be pathologic irrespective of the cause and the content of the accumulated fluid.1,2


Pleural Effusion Mesothelial Cell Malignant Mesothelioma Psammoma Body Serous Membrane 
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© Springer-Verlag London Limited 2012

Authors and Affiliations

  1. 1.Department of Pathology, İstanbul Faculty of Medicineİstanbul UniversityİstanbulTurkey

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