Relevant incidental findings at abdominal multi-detector contrast-enhanced computed tomography: A collateral screening?

Table 1 Percentage of relevant incidental findings among inpatients and outpatients, with or without a previous exam n (%)

	Previous exam		P	Odds ratio
	Yes	No		(no/yes)
Inpatients	14/187 (7.5)	94/283 (33.2)	< 0.001	4.7
Outpatients	16/253 (6.3)	71/217 (22.4)	< 0.001	3.7
p	0.632	0.003

P-values were calculated using the χ² test.

Table 2 Number of inpatients and outpatients with or without a previous exam n (%)

	Previous exam		Yes/no
	Yes	No
Inpatients	187/1040 (18.0)	283/1040 (27.2)	0.66
Outpatients	253/1040 (24.3)	317/1040 (30.5)	0.80
Inpatients/outpatients	0.74	0.89	P = 0.152

P-value was calculated using the χ² test.

Table 3 Overall number of reports and relevant incidental findings per radiologist n (%)

Radiologist	Overall		Inpatients		Outpatients
	Reports	Relevant IFs	Reports	Relevant IFs	Reports	Relevant IFs
A	69/1040 (6.6)	11/69 (16.0)	43/470 (9.1)	8/43 (18.6)	26/570 (4.6)	3/26 (11.5)
B	59/1040 (5.7)	11/59 (18.6)	21/470 (4.4)	3/21 (14.3)	38/570 (6.6)	8/38 (21.1)
C	164/1040 (15.8)	23/164 (14.0)	75/470 (16.0)	12/75 (16.0)	89/570 (15.6)	11/89 (12.4)
D	353/1040 (33.9)	81/353 (22.9)	145/470 (30.9)	41/145 (28.2)	208/570 (36.4)	40/208 (19.2)
E	160/1040 (15.4)	21/160 (13.1)	48/470 (10.2)	9/48 (18.7)	112/570 (19.6)	12/112 (10.7)
F	102/1040 (9.8)	12/102 (11.8)	70/470 (14.9)	10/70 (14.3)	32/570 (5.6)	2/32 (6.2)
G	8/1040 (0.8)	3/8 (37.5)	5/470 (1.1)	2/5 (40.0)	3/570 (0.5)	1/3 (33.3)
H	28/1040 (2.7)	8/28 (28.6)	11/470 (2.3)	4/11 (36.4)	17/570 (3.0)	4/17 (23.5)
I	97/1040 (9.3)	25/97 (25.8)	52/470 (11.1)	19/52 (36.5)	45/570 (7.9)	6/45 (13.3)
Total	1040/1040 (100.0)	195/1040 (18.8)	470/470 (100.0)	108/470 (23.0)	570/570 (100.0)	87/570 (15.3)

Comparison between relevant incidental finding rate in inpatients or in outpatients was calculated using the χ² test and resulted significantly different (P < 0.001). IFs: Incidental findings.

Table 4 Relevant incidental findings stratified according to 10-year age groups subdivided between inpatients, outpatients, and overall n (%)

Age	Overall		Inpatients		Outpatients
	CeCT	Relevant IFs	CeCT	Relevant IFs	CeCT	Relevant IFs
10-19	6/1040 (0.6)	0/6 (0.0)	3/470 (0.6)	0/3 (0.0)	3/570 (0.5)	0/3 (0.0)
20-29	17/1040 (1.7)	2/17 (11.8)	8/470 (1.7)	2/8 (25.0)	9/570 (1.6)	0/9 (0.0)
30-39	40/1040 (3.8)	5/40 (12.5)	8/470 (1.7)	1/8 (12.5)	32/570 (5.6)	4/32 (12.5)
40-49	88/1040 (8.5)	27/88 (30.6)	34/470 (7.2)	10/34 (29.4)	54/570 (9.4)	17/54 (31.5)
50-59	130/1040 (12.5)	20/130 (15.4)	55/470 (11.7)	11/55 (20.0)	75/570 (13.6)	9/75 (12.0)
60-69	260/1040 (25.0)	40/260 (15.4)	112/470 (23.8)	20/112 (17.8)	148/570 (26.0)	20/148 (13.5)
70-79	361/1040 (34.7)	73/361 (20.2)	173/470 (36.8)	42/173 (24.2)	188/570 (33.0)	31/188 (16.5)
80-89	129/1040 (12.4)	25/129 (19.4)	72/470 (15.3)	19/72 (26.4)	57/570 (10.0)	6/57 (10.5)
90-99	9/1040 (0.8)	3/9 (33.3)	5/470 (1.1)	3/5 (60.0)	4/570 (0.7)	0/4 (0.0)
Tot	1040/1040 (100)	195/1040 (18.8)	470/470 (100)	108/470 (23.0)	570/570 (100)	87/570 (15.2)

CeCT: Contrast-enhanced computed tomography; IFs: Incidental findings.

Table 5 Distribution of relevant incidental findings among involved organs n (%)

Anatomical site	Relevant IFs
Kidney	28/195 (14.4)
Gallbladder	27/195 (13.85)
Lung	24/195 (12.3)
Uterus	20/195 (10.3)
Adrenal gland	19/195 (9.7)
Vessels	19/195 (9.7)
Musculoskeletal	12/195 (6.2)
Ovary	12/195 (6.2)
Liver	7/195 (3.6)
Spleen	6/195 (3.1)
Prostate	6/195 (3.1)
Bowel	5/195 (2.6)
Bladder	4/195 (2.1)
Pancreas	3/195 (1.5)
Testicles	3/195 (1.5)

IFs: Incidental findings.

Table 6 Relevant incidental findings in 1040 contrast enhanced computer tomography examinations

IF	n %
Cholelithiasis	27 (2.6%)
Uterine lesion	20 (1.9%)
Adrenal mass	19 (1.8%)
Non-simple renal cyst	15 (1.4%)
Lung nodule	13 (1.3%)
Adnexal mass	12 (1.2%)
Kidney stones	10 (1.0%)
Pleuric effusion	8 (0.8%)
Focal liver lesion	6 (0.6%)
Enlarged prostate	6 (0.6%)
Focal splenic lesion	5 (0.5%)
Abdominal aortic aneurysm	4 (0.4%)
Bladder wall thickening	4 (0.4%)
Aortic ectasia	4 (0.4%)
Inguinal hernia	4 (0.4%)
Focal pancreatic lesion	3 (0.3%)
Focal renal lesion	3 (0.3%)
Atheromasic aorta	3 (0.3%)
Iliac aneurysm	3 (0.3%)
Focal lesion of bones	3 (0.3%)
Lung consolidation	2 (0.2%)
Focal muscolar lesion	2 (0.2%)
Appendicular enlargement	2 (0.2%)
Hydrocele testis	2 (0.2%)
Splenic artery aneurysm	1 (0.1%)
Mesenteric artery aneurysm	1 (0.1%)
Vertebral fracture	1 (0.1%)
Diverticulitis	1 (0.1%)
Ectasic portal vein	1 (0.1%)
Endoleak	1 (0.1%)
Emphysema	1 (0.1%)
Spinal disc herniation	1 (0.1%)
Colonic cancer	1 (0.1%)
Stasis liver	1 (0.1%)
Incisional hernia	1 (0.1%)
Femoral artery occlusion	1 (0.1%)
Splenomegaly	1 (0.1%)
Subocclusion	1 (0.1%)
Varicocele	1 (0.1%)
Total	195 (18.7%)

IF: Incidental finding.