a core sampling biopsy device is compatible with use in a magnetic resonance imaging environment by being driven by either a pneumatic rotary motor or a piezoelectric drive motor . the core sampling biopsy device obtains a tissue sample , such as a breast tissue biopsy sample , for diagnostic or therapeutic purposes . the biopsy device may include an outer cannula having a distal piercing tip , a cutter lumen , a side tissue port communicating with the cutter lumen , and at least one fluid passageway disposed distally of the side tissue port . the inner cutter may be advanced in the cutter lumen past the side tissue port to sever a tissue sample .