. Author manuscript; available in PMC: 2010 Aug 11.

Published in final edited form as: Phys Med Biol. 2007 Dec 19;53(1):203–216. doi: 10.1088/0031-9155/53/1/014

Table 2.

Radiation pneumonitis grading system.

Grading system	Grade	Definition
The modified National	0	No increase in symptoms
Cancer Institue Common	1	Symptoms not requiring initiation or increase in steroids and/or oxygen
Toxicity Criteria (NCICTC)	2	Symptoms requiring initiation or increase in steroids
	3	Symptoms requiring oxygen
	4	Symptoms requiring assisted ventilation or causing death.
Southwest Oncology	1	Radiographic changes are observed but the symptoms do not require steroids
Group Toxicity Criteria	2	Requiring steroids
	3	Oxygen required
	4	Assisted ventilation is necessary
	5	Fatal