Fig. 2.

A ferromagnetic passively navigated sidecut 2.2-mm biopsy needle. The solid triangle indicates a stopper, allowing to mark the depth of the needle insertion calculated by the neuronavigation system. Open triangles indicate passive neuronavigation markers. A close-up view of a 9-mm long cutting window of the biopsy needle allowing to obtain a tissue sample of the estimated volume of over 30 mm³ is visible in the lower-left corner