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Figure 4a. Artificial widening of the mediastinum for the parasternal approach. (a) CT scan shows an anterior mediastinal mass (M) and a narrow parasternal mediastinal window (arrowhead). The needle (arrow) has been placed in the soft tissues. (b) CT scan obtained after injection of saline solution shows a widened mediastinum (arrowhead), which allows extrapleural placement of the biopsy needle (arrow).
