Pre-operative predictive factors for gallbladder cholesterol polyps using conventional diagnostic imaging

Table 1 Clinical and laboratory characteristics of patients with gallbladder polyps (mean ± SD)

Histologic finding	Cholesterol polyp	Non cholesterol polyp	P-value
Age (yr)	40.98 ± 9.41	48.39 ±16.87	< 0.05
Sex (male/female)	25/16	12/6	0.677
Height (m)	1.6703 ± 0.09	1.65 ± 0.07	0.595
Weight (kg)	69.39 ± 13.26	64.85 ± 10.73	0.207
Cholelithiasis(case)	3	2	0.63
BMI (kg/m2)	24.83 ± 2.92	23.80 ± 3.23	0.245
Fasting glucose (mg/dL)	97.05 ± 21.76	96.94 ± 15.0	0.985
Insulin (μIU/mL)	10.54 ± 3.63	9.47 ± 2.71	0.412
Homa-IR	1.49 ± 1.85	1.26 ± 1.35	0.64
HbA1c (%)	5.58 ± 0.74	5.41 ± 0.23	0.553
US size (mm)	9.95 ± 2.31	11.94 ± 4.02	< 0.05
CT size (mm)	6.77 ± 2.65	9.78 ± 5.19	< 0.05
Pathology size (mm)	4.83 ± 2.97	11.06 ± 5.11	< 0.01

Table 2 The number of polyps in cases with cholesterol and non-cholesterol polyps n(%)

		Cholesterol polyp	Non-cholesterol polyp	Total
Ultrasonographic findings (P < 0.01)
Polyp number	Solitary	19 (46.3)	16 (88.8)	35 (59.3)
	Multiple	22 (53.7)	2 (11.1)	24 (40.7)
Total		41 (69.5)	18 (30.5)	59 (100.0)
Pathologic finding (P < 0.01)
Polyp number	Solitary	11 (26.8)	15 (83.3)	26 (44.1)
	Multiple	30 (73.2)	3 (16.7)	33 (55.9)
Total		41 (69.5)	18 (30.5)	59 (100.0)

Table 3 The difference in the maximum polyp size between cholesterol and non-cholesterol polyps (mean ± SD)

	Cholesterol polyp	Non-cholesterol polyp	P-value
US-CT size difference (mm)	5.66 ± 3.87	2.17 ± 2.12	0
US size > CT size1	40/41	12/18	0.002
CT undetectable rate(%)	15/41 (36.6)	0/18 (0)	0.001
US-pathologic size difference (mm)	5.12 ± 3.42	0.89 ± 3.69	0

¹Indicates number of patients having a larger size with US than CT.

Table 4 The correlation of size between cholesterol and non-cholesterol polyps

Correlation coefficients		Pathologic size	US size	CT size
Pathologic size	Non-cholesterol polyp	1	0.698b	0.746b
	Cholesterol polyp	1	0.181	0.324
US size	Non-cholesterol polyp	0.698b	1	0.925d
	Cholesterol polyp	0.181	1	0.427c
CT size	Non-cholesterol polyp	0.746b	0.925d	1
	Cholesterol polyp	0.324	0.427c	1

^bP < 0.01 vs Pathologic size, ^bP < 0.05 vs US size.