Retrospective case-control study to predict a potential underlying appendiceal tumor in an acute appendicitis context based on a CT-scoring system

Highlights: • A patient with an appendicolith is 3-fold less likely to have an appendiceal neoplasm than a patient without this incidental finding. • Mural calcifications are the strongest positive predictive factor of an underlying tumor with an OR = 47. • Using a cutoff ≥ 1, our diagnostic score has a positive likelihood ratio = 13.5 for an underlying tumor. To assess CT signs to discriminate an appendiceal tumor versus a non-tumoral appendix in an acute appendicitis context.