 However, studies recommend that this treatment modality be restricted to centers with expertise in the surgical placement of these pumps, and the technical aspects of localized chemotherapy.Before the placement of the HAI pump, the patients undergo an arteriogram to outline the blood supply of the liver and to identify any anatomical anomalies.The procedure begins with an exploratory laparotomy to confirm the unresectable nature of the tumor, and then the gallbladder is removed by performing a cholecystectomy.