In treating tumors of the lung, the threshold dose for radiation pneumonitis is ____ cGy.

In the context of radiation therapy for lung tumors, the threshold dose for radiation pneumonitis typically falls within the range of 2000-2500 cGy. This threshold is critical to understand because radiation pneumonitis is an inflammation of the lung tissue that can occur following radiation therapy, and it is important for clinicians to monitor the cumulative dose delivered to the lung to minimize the risk of this side effect.

The risk of developing pneumonitis increases significantly with doses exceeding this threshold. Thus, when planning treatment, radiation oncologists pay close attention to the total lung dose to keep it as low as possible, especially if patients have pre-existing lung conditions that may increase their vulnerability to radiation-induced injury. This knowledge aids in treatment planning and allows for appropriate risk assessment and patient counseling.

Increasing the radiation dose above this threshold can lead to heightened risks and adverse outcomes, making it essential to remain within the established limits during planning and delivery of radiation therapy for lung tumors.