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Central and peripheral location of biopsy needle. (A) Anteroposterior (AP) spot film demonstrates the guiding cannula in a peripheral location to obtain a core sample. (B) AP spot film demonstrates the guiding cannula in a more central location to obtain a core sample. (C) AP spot film obtained during biopsy demonstrates the needle within the liver parenchyma. The position of the guiding cannula in this case is central.
