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The Radiation Therapy Oncology Group (RTOG) scoring criteria for radiation-induced oral mucositis. (a) Grade I: Erythema; (b) Grade II: Patchy reaction (<1.5 cm, non-contiguous); (c) Grade III: Confluent mucositis (>1.5 cm, contiguous); (d) Grade IV: Ulceration, necrosis, bleeding. Republished with the permission of patients.
