Figure 1b. Longitudinal US images relative to transducer show placement of cryoprobe in tumor (arrows). (a) Invasive cancer. (b) Cryoprobe placed through tumor with US guidance. Procedure is similar to US-guided core-needle biopsy. Tip (arrowhead) of probe was advanced 1.0-1.5 cm beyond distal aspect of tumor and allowed ice ball to engulf entire tumor.