costodiaphragmatic recess


cos·to·di·a·phrag·mat·ic re·cess

[TA] 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 costodiaphragmaticus [TA], phrenicocostal sinus