Figure 2. Dual-energy IV contrast abdominopelvic CT performed on a 66-year-old male admitted to the hospital with a complaint of pain in the right upper quadrant revealed perforation of the gallbladder wall.

Transmural loss of wall enhancement on (a) 45 keV virtual monoenergetic images (white arrow) and (b) iodine overlay map images (white arrow). (c) Necrosis and perforation in the gallbladder wall.