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Figure 4a. Effect of gun positioning during core needle biopsy for a deep lesion. (a) Drawing illustrates that, when the gun is held rightside up, the needle must be angulated toward the chest wall. (b) Drawing illustrates that, with the gun flipped upside down, the lesion can be approached with the needle parallel to both the chest wall (for greater safety) and the transducer face (for better needle visualization).
