TABLE 1.

The grades of CIP based on clinical manifestations and radiological findings

Grades	Clinical manifestations	Radiological findings
Grade 1	Asymptomatic	One lobe of the lung or <25% of the lung parenchyma
Grade 2	New respiratory symptoms, or aggravation of existing symptoms such as shortness of breath, cough, chest pain, fever, and increased oxygen requirements	Lesions affect 25%–50% of the lung parenchyma
Grade 3	Severe symptoms, limited daily activities	Lesions affect all lung lobes or >50% of the lung parenchyma
Grade 4	Life‐threatening respiratory damage

Abbreviation: CIP, checkpoint inhibitor pneumonia.