Fig. 3
US-guided percutaneous cryoanalgesia sequence. A In gray scale images, US contrast is adjusted to magnify anatomical landmarks and the cryoprobe. Then, color Doppler detects the intercostal neurovascular bundle. B 14G angiocath is not clearly defined and the twinkling artifacts show that the angiocath tip is placed deep inside the intercostal space beyond the intercostal nerve. C Angiocath is then retired a few millimeters until the tip is placed above the nerve. The ice ball is visualized above the intercostal nerve and the cryoprobe contour is highlighted by the twinkling artifact