• Sung Yoon Park, Jong Yun Won, Young Taik Oh, Dae Chul Jung, Gyoung Min Kim, and Man Deuk Kim.
• 1 Department of Radiology, Yonsei University College of Medicine , Seoul , South Korea.
• Br J Radiol. 2018 Jul 27: 20170951.

ObjectiveWe analyzed CT characteristics of radiographic ice ball according to anatomical location and freezing number in renal cryoablation.Methods30 patients who underwent percutaneous cryoablation for renal lesions. Computed tomography (CT) was conducted at 9 min during every freezing in order to evaluate a radiographic ice ball. Software was used to reconstruct CT images of the radiographic ice ball perpendicular to cryoprobes. For each radiographic ice ball, two types of radius were measured: (a) lateral radius from epicenter to perirenal direction and (b) medial radius from epicenter to renal sinus direction. Lateral and medial radius or diameters (lateral radius plus medial radius) during the first and second freezing were compared using paired t-test, respectively.ResultsMedial radius of radiographic ice ball was significantly shorter than lateral radius (first freezing, 13.8 vs 17.0 mm, p < 0.001; second freezing, 16.0 vs 19.3 mm, p < 0.001). The diameter during the second freezing was significantly longer than that during the first freezing (35.3 vs 30.8 mm, p < 0.001).ConclusionIn renal cryoablation, evaluating radiographic ice ball helps identify potential postulated cold sink effect in the central portion of kidney. Advances in knowledge: Radiologic information of postulated cold sink effect in the kidney may help secure sufficient safety margins.

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