Table 1 Structured reporting template of abdominal CT: APPAC multicenter

I Descriptive part of the report: Technique and findings in the whole abdomen

II Structured report of appendix:

 1) Appendix Visualisation

Report one of the following:

Not visualised/ Partly or unclearly visualised/ Completely visualised

 2) Appendix transverse diameter (mm):

 3) Probability of appendicitis

Report one of the following:

Not likely/ Rather unlikely/ Rather likely/ Very likely

 4) Categorisation of the appendicitis

Report either I or II, if any:

I Uncomplicated appendicitis: transverse diameter > 6 mm with typical findings

-wall thickening and enhancement

-periappendiceal edema and/or minor amount of fluid

II Complicated appendicitis: Appendicitis with at least one of the following:

-Appendicolith: >  3 mm stone within appendix

-Abscess: periappendiceal walled of collection with enhancing walls

-Perforation: appendiceal wall enhancement defect and periappendiceal excess of fluid and/or infectious phlegmon and/or extraluminal air

-Tumor: tumor-like prominence of appendix

Other diagnosis: Report if any

Diverticulitis/ Complicated ovarian cyst/ Pelvic inflammatory disease/ Colitis/ Ileitis /Intestinal obstruction or ileus/ Ureter stone/ Hydronephrosis/ Tumor/ Other diagnosis