Table 4. Toxicity scales for radiation pneumonitis.

Criteria	1	2	3	4
CTCAE v.2.0	Radiographic changes but asymptomatic or symptoms not requiring steroids	Radiographic changes and requiring steroids	Requiring oxygen	Requiring assisted ventilation
CTCAE v.3.0	Asymptomatic; radiographic findings only	Symptomatic; not interfering with ADL	Symptomatic; interfering with ADL; O2 indicated	Life-threatening; ventilatory support indicated
RTOG/EORTC (LENT-SOMA)	Asymptomatic or mild symptoms (dry cough), with radiographic findings	Moderately symptomatic (severe cough, fever)	Severely symptomatic	Severe respiratory insufficiency; continuous oxygen/assisted ventilation
SWOG	Asymptomatic or symptoms not requiring steroids, with radiographic findings	Initiation or increase in steroids required	O2 required	Assisted ventilation necessary

ADL, activities of daily living; CTCAE, Common Terminology Criteria for Adverse Events; EORTC, European Organisation for Research and Treatment of Cancer; LENT-SOMA, Late effects of normal tissue: subjective, objective, management and analysis; RTOG, Radiation Therapy Oncology Group; SWOG, Southwest Oncology Group.