The article reports on first experiences with the stereotactic diagnosis device "Mammotest" in the diagnosis of diseases of the breast. Preoperative stereotactic carbon marking of non-palpable changes requiring clarification via mammography was successful in 94% of the cases. With the stereotactic cytological clarification by means of Nordenström's cannula the high rate of cellular material which could not be clarified, was unsatisfactory. Stereotactic histological punch biopsy in case of unclear mammographic findings enables exact localisation of the punch and histological examination of the punch biopsy. Mammographic follow-up did not yield any false negative finding to date.
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