Figure 3From: Ultrasound-guided pleural puncture in supine or recumbent lateral position - feasibility studyThoracentesis: the operator places the linear probe transversally. A small pleural effusion in the costophrenic sinus appears as a transonic triangle bounded laterally by the diaphragm and the chest wall. Puncture site is identified as the apex of this triangle. An in-plane approach allows the Veres needle to be followed throughout the entire procedure.Back to article page