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Medical Definition of Phrenicocostal sinus
1. The cleftlike extension of the pleural cavity between the diaphragm and the rib cage; pleural effusions collect here when in the upright position, and since the lung only partially enters, this is the site of thoracocentesis. Synonym: recessus costodiaphragmaticus, phrenicocostal sinus. (05 Mar 2000)
Lexicographical Neighbors of Phrenicocostal Sinus
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