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. 2023 Apr 20;27(7):1473–1485. doi: 10.1007/s11605-023-05626-8

Table 5.

PPV and NPV of individual MRI features for discriminating complicated from simple appendicitis, as identified in the systematic review; for the data reported by Leeuwenburgh et al.,61 the PPV and NPV were calculated to exclude cases without appendicitis, based on the reported values; the data reported by Zhu et al.39 was excluded due to an unusually high prevalence of complicated appendicitis

MRI feature PPV NPV
Appendiceal diameter > 7 mm61 26.3 (30/114) 100 (2/2)
Periappendiceal fat infiltration61 26.4 (29/110) 83.3 (5/6)
Periappendiceal fluid61 30.7 (27/88) 89.3 (25/28)
Absence of intraluminal air61 24.5 (26/106) 60 (6/10)
Appendicolith61 30.8 (16/52) 78.1 (50/64)
Extraluminal appendicolith32 100 (1/1) 73.5 (25/34)
Appendiceal wall defect32 75~85.7 (6/8 ~ 6/7) 85.2~85.7 (23/27 ~ 24/28)
Appendiceal wall destruction61 51.9 (14/27) 82.0 (73/89)
Phlegmon32 40.9~42.9 (9/22 ~ 9/21) 92.3~92.9 (12/13 ~ 13/14)
Abscess32,61 55.6 (10/18), 85.7~100 (6/7 ~ 6/6) 79.8 (79/99), 85.7~86.2 (24/28 ~ 25/29)
Extraluminal free air32,61 100 (1/1), 100 (2/2) 75 (87/116), 75.8 (25/33)
Restricted diffusion of appendiceal wall61 27.3 (27/99) 86.7 (13/15)
Restricted diffusion of appendiceal lumen61 27.9 (24/86) 82.1 (23/28)
Restricted diffusion of focal collections61 55.6 (15/27) 83.9 (73/87)