Fig. 3

(A) Pointer registration of each fiducial marker. (B) The sure track system is attached to cryo-needle and calibrated. The needle can be inserted into the tumor using navigation according to pre-operative 3D planning. Ultrasonography was used to verify position. (C) Stealth station MRI screen navigation shows bright and dark areas, indicating desmoid tumor viability. (D) Cryo-needles inserted according to the preoperative plan, using warm saline to protect the skin. A thermometer guide needle was also used to monitor and maintain core tumor temperature of below − 40 degrees Celsius