PREOPERATIVE TRANSHEPATIC PERCUTANEOUS CHOLANGIOGRAPHY. ITS UTILITY IN THE DIFFERENTIAL DIAGNOSIS OF OBSTRUCTIVE JAUNDICE
COLANGIOGRAF'IA PERCUT'ANEA TRANSHEP'ATICA PREOPERATORIA. SU UTILIDAD EN EL DIAGN'OSTICO DIFERENCIAL DE LAS ICTERICIAS OBSTR'UCTIVAS