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Figure 5a. Parasternal approach with US guidance. (a) CT scan shows an anterior mediastinal mass (M) anterior to the ascending aorta (A). (b) Transverse sonogram shows a biopsy needle (curved arrow) advanced lateral to the internal mammary vessels (straight arrow) and into the mass (M), which is anterior to the aorta (A) and right pulmonary artery (PA). Note the location of the sternum (white arrowheads) and the echogenic margin of the right lung (black arrowheads).
