The Manitou

What surgeons thought to be a tumor growing on the neck of patient Karen Tandy is actually a fetus growing at an abnormally accelerated rate. But when Karen reaches out to former lover and phony psychic Harry Erskine, he discovers that she is possessed by the reincarnation of a 400-year old Native American demon. Now with the help of a modern-day medicine man, Erskine must survive this ancient evil's rampage of shocking violence, and forever destroy the enraged beast known as the Manitou. (official distributor synopsis)