A, A 15-mm balloon expanded to high pressure was unable to relieve the waist in this lesion with 2 concentric stents, which is caused by complete expansion and shortening of a Palmaz P154 stent, across which a Palmaz P188 stent has been placed. B, The waist and the fully expanded outer stent can be appreciated in this fluoroscopic image (arrows). C and D, A 12-mm Atlas balloon inflated to 28 atm was successful at relieving the resistant waist in the stents and fracturing the fully expanded and shortened Palmaz P154 stent (arrows).