| Acute appendicitis | Nonspecific; a radiopaque fecalith is visible in fewer than 5 percent of patients | Inflamed appendix (larger than 6 mm in diameter), appendiceal wall thickening with wall enhancement, and periappendiceal inflammatory changes |
| Gastrointestinal bezoar | Mottled radiolucencies in the interstices of a solid mass | Intraluminal mass with a mottled air pattern (characteristic) |
| Ingested foreign body | Usually unreliable for nonmetallic foreign bodies | May show the foreign body itself; signs of perforation, such as intestinal wall thickening, localized pneumoperitoneum, regional fat stranding, and intestinal obstruction |
| Ovarian cystic teratoma | A tooth or other calcifications Within fatty density | Complex tumor components (e.g., teeth and other calcifications, tufts of hair, fat, hemorrhage, signs of malignant change) |
| Ureterolithiasis | Radiopaque spots along the presumed course of the ureter | Ureteral calculi |