I had a distal pancreatectomy and splenectomy in July 2022. I had an IPMN cyst on the main duct in the tail of the pancreas. As it was explained to me by the surgeon, the decision for spleen resection or not would be made at some point during surgery. As I understand it, in most cases, the blood vessels shared by the pancreas and spleen are so intertwined that the cleanest and safest route is to remove the spleen ( I believe that is the rationale). I needed to get pre-surgery and post- surgery shots for meningitis and pneumonia, with periodic boosters scheduled for two and five years out, and that is the only requirement after spleen removal. I hope this is helpful. Best wishes.