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Table 1 Grading system for radiation induced lung toxicity

From: Radiation-induced lung injury: current evidence

  RTOG CTCAE v. 5.0 SWOG
Grade 0 No changes No changes Normal
Grade 1 Asymptomatic or mild symptoms Asymptomatic, only radiological, or tomographic findings Radiographic changes, symptoms do not require steroids
Grade 2 Moderate symptoms of pneumonitis (severe cough) and radiographic changes (radiographic patches) Symptomatic, does not interfere with daily activities Steroids required or tap of effusion
Grade 3 Severe symptoms of pneumonitis, dense radiographic changes Symptomatic, interferes with daily activities, requires supplemental O2 Oxygen required
Grade 4 Symptoms of severe respiratory failure requiring assisted ventilation or continuous O2 Threatens life, requires mechanical ventilation support Requires assisted ventilation
Grade 5 Death-related late effects of radiotherapy Death related severe pneumonitis
  1. RTOG Radiation Therapy Oncology Group [63], CTCAE v. 5.0 Common Terminology Criteria for Adverse Events version 5.0 [64], SWOG Southwest Oncology Group criteria [65]