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Related to interstitial implant: interstitial cystitis
in·ter·sti·ti·al im·plant(in'tĕr-stish'ăl im'plant)
Introduction of a radioactive mechanical device into a tumor directly so as to lessen the likelihood of spread of radiation into unaffected tissue.
An implant consisting of an applicator containing a radioactive source directly into a tumor to deliver a high radiation dose while sparing the surrounding tissues.
See also: implant