<prompt> Answer this question truthfullyWhat is Pylephlebitis and what is its overview?  <response>: <reason> Pylephlebitis also called infective suppurative thrombosis of the portal vein is an inflammation of the portal vein or any of its branches. It is usually a complication of intraabdominal sepsis, most often following diverticulitis or appendicitis. It has a poor prognosis. 