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Radiation planning diagram for T4 carcinoma of the right tonsil. The primary tumor volume receives 70 Gy (marked T and shaded in red). The radiation plan is designed to spare 50% of each parotid gland (blue-shaded area identified by the arrowhead). The dose distribution lines show rapid falloff in the radiation dose between the tumor and the majority of the parotid gland. A small amount of the gland receives high dose radiation where the tumor approaches the gland
