Forty cases of bone malignancies are discussed, where biopsy was performed with help of a new instrument. The method allowed to state or to esclude a diagnosis of primary or secundary tumor in 32 cases. In 8 cases there was no results because the bone fragments were too exiguous or derived from the healthy tissue surronding the lesion. The authors discuss the utility of this new method, which joins the advantages both of the aspiration technique and of the rotation technique for biopsy.
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