Core needle biopsies, sometimes called tru-cut biopsies, use a larger bore needle than fine needle biopsies. A larger sample of tissue is obtained than with FNA (fine needle aspiration).  A larger sample is removed, with fewer passes, more often allowing a specific cell type to be diagnosed.  [12, 13]   Most importantly, to accurately diagnose and classify most sarcomas, an expert sarcoma pathologist to examine the specimen is paramount.  Needle biopsies should be taken seriously as they can indeed cause seeding along the path of the needle. [26]  The best course of action would be to surgically remove the tunnel the needle had followed in the next surgery.  Furthermore, tumor cell displacement was observed in 32% of patients who had undergone large-gauge needle core biopsy of the breast. [27] 

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