Treatment used in addition to the primary method . Each portal for each patient requires a custom-made aperture. The shape of the hole is the approximate shape of the target being treated by the beam. A tumor that grows locally but does not spread to other parts of the body.
Benign tumors can cause problems because of their spread, as they press and displace normal tisues.
They can be dangerous in confined places such as the skull. Removing a sample of tissue for examination by a pathologist. A custom-made block positioned beyond the aperture . The contours and thickness of the block conform the beam to the shape of the far edge of the target. The radiation oncologist may implant radioactive material directly into the tumor or very close to it.