Fig. 2

Paragon bone biopsy systems (a-c). The system consists of a 9-gauge external cannula (a, red arrow) with an internal drill (b, red arrow) and a 12.5-gauge trephine biopsy needle (c-d, red arrow). When the external cannula and drill were inserted into the bone lesion, the internal drill was replaced by the trephine biopsy needle (c, red arrow). Core biopsies were then extracted through the trephine biopsy needle (d, red arrow)