[Ultrasonography and biliary calculi: a retrospective study on the diagnostic reliability]. / Ecotomografia e calcolosi biliare: studio retrospettivo sull'attendibilità diagnostica.

The Authors evaluated diagnostic reliability of echotomography in biliary tract lithiasis, reviewing a series of 130 patients (out of 171) who were surgically treated; 30 had proved to be affected with biliary main tract stones. A high rate of false negatives was documented as related to the diagnosis of lithiasis of the main biliary duct.