Table 2.

Modified scoring system for classification of both MR and ultrasound radiological findings, in cases of suspected acute appendicitis. Values range from 1 to 4; score of 1 indicates no appendicitis, score of 4 indicates appendicitis

U1/M1	Normal appendix visualised fully; no appendicitis
U2/M2	Equivocal but leaning towards no appendicitis (i.e. no appendix seen, with no secondary signs of appendicitis OR appendix seen and indeterminate features but not thought to be appendicitis OR appendix partially seen and thought to be normal)
U3/M3	Equivocal but leaning towards appendicitis (i.e. no appendix seen, but suggestive secondary signs of appendicitis such as echogenic or hyperaemic fat on ultrasound or mesenteric fat changes on MR OR appendix seen with indeterminate features suggesting appendicitis)
U4/M4	Abnormal appendix visualised; appendicitis

U ultrasound score, M MRI score