Table 1

Clinical, biochemical and ultrasonographic features of study patients, either previously or at the time of presentation

		No of patients (%)
		Previous history	At presentation
Cholecystectomy	38 (73)	–
Gall bladder in situ	–	14 (27)
Gall bladder stones	47 (90)	9 (17)
Choledochoduodenostomy, endoscopic sphincterotomy	3 (6)	–
Obstructive jaundice	22 (42)	0 (0)
Acute pancreatitis	8 (15)	0 (0)
Cholangitis	16 (31)	2 (4)
Biliary colic	29 (56)	4 (8)
Biochemical abnormalities^1-150	26 (50)	34 (65)
Bile duct dilatation at transabdominal ultrasonography^1-151	25 (48)	22 (42)
Bile duct stones at transabdominal ultrasonography^1-152	22 (42)	15 (29)

↵1-150 Raised serum aminotransferases and/or alkaline phosphatase and/or γ-glutamyl transpeptidase.
↵1-151 >8 mm in patients with gall bladder in situ; >10 mm in patients after cholecystectomy.
↵1-152 Stones visualised (unequivocal finding) or suggested (equivocal finding).