<prompt> The CT severity index in acute pancreatitis is described by:BalthazarMenginiChapmanNapelon  <response>: The CT severity index CTSI-described by Balthazar Balthazar CT Severity Index CT Grade Score A. Normal- 0 B. Enlarged gland -1 C. Peri-pancreatic inflammation- 2 D. One fluid collection- 3 E. Two or more collections- 4 Necrosis Score 30-50- 4 50 -6 Ref: ACR Appropriateness Criteria,Acute Pancreatitis. 