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Table 1.

Baseline patient demographic characteristics.

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Table 2.

CT-based radiological appearance according to the grading scale of RILI.

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Fig 1.

Concordance CT appearance, case 1.

(a) The shadow extends to the right middle and lower lobes beyond the high-dose region; this was diagnosed as diffuse consolidation at 6 months after SBRT. (b) The shadow shows consolidation, volume loss and bronchiectasis; this was diagnosed as the modified conventional pattern at 21 months after SBRT. (c) The shadow remained at 45 months after SBRT.

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Fig 2.

Concordance CT appearance, case 2.

(a) Before SBRT, the lung tumor was located in the right upper lobe. (b) The consolidation expands beyond the high-dose region; this shadow was diagnosed as diffuse consolidation at 5 months after SBRT. (c) The shadow shrank, and only a linear opacity remained. This shadow was diagnosed as a scar-like pattern at 20 months after SBRT.

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Fig 3.

Concordance CT appearance, case 3.

(a) Before SBRT, the lung tumor was located in the right upper lobe. (b) Patchy areas of hazy and consolidation are seen; this shadow was diagnosed as patchy consolidation and GGO at 5 months after SBRT. (c) The shadow forms a focal consolidation; this was diagnosed as a mass-like pattern at 17 months after SBRT. (d) The shadow shrank, but a mass-like shadow remained at 35 months after SBRT.

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Fig 3 Expand

Fig 4.

Concordance CT appearance, case 4.

(a) Before SBRT, the lung tumor was located in the left lower lobe. (b) Patchy areas of hazy are seen; this shadow was diagnosed as patchy GGO at 3 months after SBRT.

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Table 3.

Early CT appearance pattern as judged by the two observers.

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Table 4.

Late CT appearance pattern as judged by the two observers.

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Table 5.

CT-based late radiographic grading of RILI as judged by the two observers.

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Table 6.

Univariate analyses (Cox regression) for grade 2 or more (the grading was based on the radiographic grading of RILI assessed by observer 1).

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Table 7.

Multivariate analyses (Cox regression) for grade 2 or more (the grading was based on the radiographic grading of RILI assessed by observer 1).

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