[Percutaneous biopsy technic. Aspiration fine needle and cutting biopsy cannula in an experimental comparison]

Guided percutaneous biopsy for cytological or histological diagnosis is well tried. Various types of needles and calibres are available. Only few studies have been performed comparing different needle configurations. Fine needles and cutting needles were evaluated quantitatively and qualitatively in an experimental study obtaining specimens of resected tumours. Weight measurement and preservation of the material were analysed. Material for cytological diagnosis was obtained with all types of needles. Increasing needle size resulted in higher yield of diagnostic tissue. Small-bore cutting needles having an acute bevel angle provide better results in soft or semiliquid tissue. It is not necessary to increase the needle size over 18 gauge.