breast: first fine needle aspiration, now a core-needle aspiration...
A fine needle aspiration can only obtain tissue samples of the size that can fit through the needle. Such small samples may not adequately refect the composition of an entire suspicious area.
A core biopsy obtains larger samples, which may be more representative of the area in question.
However, "the final word," or a completely definitive answer, can only be obtained through a pathologist's study of an entire specimen resulting from an excicion biopsy.
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