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Four faces of a parapneumonic effusion: Pathophysiology and varied radiographic presentations


Steven A. Sahn, Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Suite 812 CSB, 96 Jonathan Lucas St, PO Box 250630, Charleston, SC 29425, USA. Email:


Abstract:  We report a patient methicillin-resistant Staphylococcus aureus pneumonia who developed fluid collections in three spaces in the thorax, the pleural space, the pericardial space, and a pre-existing bulla, in addition to mediastinal oedema. We discuss the universal pathogenesis for the development of these fluid collections and the explanation for the most common presentation being a parapneumonic effusion.

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