Table 1.

Radiotherapy Oncology Group scoring criteria for acute radiation toxicity

Tissue toxicity	Grade 0	Grade 1	Grade 2	Grade 3	Grade 4
Mucous membrane	No change over baseline	Irritation, might experience mild pain not requiring analgesic	Patchy mucositis that produces an inflammatory serosanguinous discharge, might experience moderate pain requiring analgesic	Confluent, fibrinous mucositis, might include severe pain requiring narcotics	Ulceration, hemorrhage, and necrosis