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An effusion is an abnormal fluid collection.

They can be grouped the following way:[1]

Type Appearance Clinical Image
Serous clear transudate (???) [1][2]
Serosaginous somewhat cloudy serous + blood image
Serofibrinous appearance ??? clinical ??? [2][3]
Purulent opaque/yellow infection (implies presence of PMNs);
called empyema in plural space

See also


  1. Klatt, Edward C. (2006). Robbins and Cotran Atlas of Pathology (1st ed.). Saunders. pp. 136. ISBN 978-1416002741.
  2. URL: http://library.med.utah.edu/WebPath/INFLHTML/INFL062.html. Accessed on: 13 November 2010.
  3. URL: http://www.sciencesway.com/vb/showthread.php?p=67288. Accessed on: 13 November 2010.