Heterotopia: medical definition

I would like to take a moment to relate Foucault's philosophies and terminologies to outside sources. Foucault's concept of heterotopia is difficult to grasp at first, but he does a wonderful job of explaining all aspects of how he views the word. Today heterotopia is used in the medical field. Medical Webster defines Heterotopia as such: misplacement or displacement, as of an organ; displacement of an organ or other body part to an abnormal location. I had a pre-med friend help me to understand this idea. Suppose a liver is displaced within the body, but is still able to function with the other organs. The liver is still a liver and has a concrete place, however it's function is projected within that space. The other organs interact with the projected liver, as if it was in its proper place. The body may reject the current concrete placing of the liver, sending out cells to attack the "intruder", but the projected place, where the liver should be, is left alone. The cells within that area interact as if the liver was in its proper place.