infratentoriumListen to pronunciation(IN-fruh-ten-TOR-ee-um)The lower back part of the brain that contains the cerebellum and brain stem. Examples of tumors that form in the infratentorium are medulloblastomas and brain stem gliomas.Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#