A word used by doctors and nurses to imply that a patient's problems are
all in their
mind. The tentorium is a membrane just under the brain, so "supratentorial" refers to what is above that, namely the brain. This term can be used in
front of the patient or patient's family because it sounds like technical jargon.
Patient: "Every time
Dr Phil comes on TV, my arms and
legs start twitching!"
Doctor, quietly to nurse: "Seems to be a supratentorial problem."
Then to patient, condescendingly: "Sorry, dear, we're just talking shop. Go on."