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Figure 1a. US images. (a) Transverse view of developing iceball (<1 cm in diameter; straight arrows) in 2.3-cm-diameter fibroadenoma (arrowheads) at initiation of freeze. Thermocouple tip (curved arrow) is 7 mm from the cryoprobe. (b) Longitudinal view of fibroadenoma (arrowheads) with a 12-gauge trocar placement needle (arrows) prior to removal of the stylet and replacement with the cryoprobe. (c) Transverse view of growing iceball (straight arrows) at 2 (left) and 3 (right) minutes, and thermocouple (curved arrow) is just becoming engulfed in ice at 6°C and –6°C, respectively. At 3 minutes, note the thickened skin distance (bracket) due to interval saline injection. (d) Transverse view of a large unusually shaped (ie, discoid, not cylindrical) fibroadenoma with cryoprobes (straight arrows) in place (top) and growing ice at 1 minute (bottom). The thermocouple (curved arrow) is about to be engulfed in ice. The iceball subsequently fused to create a smooth discoid shape, which was only possible with the probes placed less than 1.5 cm apart and approximately 1 cm from the fibroadenoma margin.
