Lacrimal apparatus - The lacrimal apparatus is the system in the body that produces and drains tears.

Radiation nephritis - t he result of the kidneys being included within a therapeutic field of radiation beyond tolerance.   It is an acute reaction if tolerance is exceeded.

Renal failure - inability of the kidneys to excrete wastes and to help maintain the electrolyte balance cause by exceeding tolerance.   This is a severe reaction.

Active spinal cord – extends from the foramen magnum to L2

Transverse myelitis – inflammation of the spinal cord caused by exceeding tolerance of that part of the active spinal cord.   This inflammation can damage or destroy myelin, the fatty insulating substance that covers nerve cell fibers. This damage causes nervous system scars that interrupt communications between the nerves in the spinal cord and the rest of the body.

Unressected lung cancer – is when the patient has not had surgery.

Radiation pneumonitis – occurs when tolerance is exceeded to the lung. The patient develops pulmonary fibrosis, radiation-induced lung damage.

Pulmonary fibrosis - scarring, or fibrosis, of the lungs. In time, this fibrosis can build up to the point where the lungs are unable to provide oxygen to the tissues of the body.