Biliary brush cytology: Factors associated with positive yields on biliary brush cytology

Table 1 All variables studied for positive cytology brush

Variable	Value
Age (yr, range)	66.3 (21-92)
Gender (female)	51.30%
Location of stricture
Lower CD	124
Mid + Upper CD	63
No stricture	12
CT scan findings
CT not done	35
Mass not seen	95
Mass < 1 cm	5
Mass 1-3 cm	39
Mass > 3 cm	25
Length of stricture
No defined stricture	14
Stricture < 1 cm	30
Stricture 1-3 cm	125
Stricture > 3 cm	30
Endoscopic dilation prior to brushing	15%
Final diagnosis
Benign	65
Malignant	124
Unknown	10

CD: Common duct.

Table 2 Variables associated with positive cytology brushing

Variable	Odds ratio (95% CI)
Age	1.02 (1.00-1.05)
CT scan findings
Mass < 1 cm	1
Mass 1-3 cm	2.22 (1.01-4.89)
Mass > 3 cm	2.86 (1.07-7.64)
Length of stricture
Stricture < 1 cm	1
Stricture 1-3 cm	3.49 (1.18-10.2)
Stricture > 3 cm	7.70 (2.15-27.5)