intracavitary

adjective

in·​tra·​cav·​i·​tary -ˈkav-ə-ˌter-ē 

: situated or occurring within a body cavity

especially : of, relating to, or being treatment (as of cancer) characterized by the insertion of especially radioactive substances in a cavity

treatment of cervical cancer by intracavitary irradiation

intracavitarily

-ˌkav-ə-ˈter-ə-lē 

adverb