Important CT findings for prediction of severe appendicitis: involvement of retroperitoneal space

Table 1 Distribution of observed radiological changes in RPS segments

		LCP	RRP	RMP	BS	SFP	CFP
Complicated appendicitis (true positive)	≧16y	49	38	33	12	12	82
Complicated appendicitis (true positive)	<16y	4	5	3	1	5	17
Uncomplicated appendicitis (false positive)	≧16y	7	7	5	2	1	46
Uncomplicated appendicitis (false positive)	<16y	6	3	3	0	0	15
PPV	≧16y	0.88	0.84	0.87	0.86	0.92	0.64
PPV	<16y	0.40	0.63	0.50	1.0	1.0	0.53
NPV	≧16y	0.53	0.47	0.46	0.40	0.41	0.48
NPV	<16y	0.60	0.63	0.61	0.61	0.65	0.72

Significantly more segments were involved (i.e. radiographical changes were observed) in complicated appendicitis group. CFP, which is closest to the pelvic extraperitoneal space, was predominantly involved. Positive predictive value (PPV) of complicated appendicitis was highest for SFP in older patient group while PPV was highest for SFP and BS in younger patient group.

ISSN: 1749-7922