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phrenicocostal sinus (medicine)


phrenicocostal sinus -->
costodiaphragmatic recess


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.