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Figure 11b. Retroaortic paravertebral approach. (a) CT scan shows an 18-gauge guide needle (thick arrow) inserted in the paravertebral space (thin arrows) and advanced between the descending aorta (DA) and vertebral body after widening of these spaces by injection of saline solution. A 22-gauge needle was advanced through the guide needle to obtain aspirates from a subcarinal mass (M). E = esophagus. (b) CT scan shows use of coaxial 18- and 22-gauge needles (black arrow) for biopsy of a left pretracheal mass (M). Saline solution was administered to widen the paravertebral (white arrow) and retroaortic spaces.
