Definition: 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(s): recessus costodiaphragmaticusTA, phrenicocostal sinus
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© Copyright 2019 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.