Objective: To assess the effectiveness of LC as compared to conservative treatment in patients after a first episode of 'EUS-negative' IAP. Study design: Multicenter randomized controlled trial. Patients will be followed for one year after randomization. Study population: Adults with a first episode of 'EUS-negative' IAP. Intervention (if applicable): Laparoscopic cholecystectomy versus conservative treatment. Main study parameters/endpoints: The primary endpoint is pancreatitis recurrence. Secondary endpoints include occurrence of biliary events, complications of LC, number and severity of recurrent episodes of pancreatitis, quality of life (QALY), costs (hospital and societal) and cost-effectiveness.