Inclusion Criteria:  Patient with obstruction of the bile duct(s) planned for internal external PTBD;  Proficient in Dutch language; Written informed consent.  Exclusion Criteria:  Age < 18 years;  No informed consent; Pregnancy; Obstruction caused by gall stones; External PTBD catheter (without internalization); Patient has already a PTBD catheter; More than 1 PTBD catheter is placed at intervention.