Table 4 Scoring system used to determine the severity of microscopic lung lesions

Bronchointerstitial pneumonia

BALT in > 5 bronchi or bronchioles (1–2 BALT per structure)

1.- BALT in > 5 bronchi or bronchioles (50 % of the structure is surrounded by BALT)

or

2.- BALT in > 5 bronchi or bronchioles (1–2 BALT per structure) and one bronchus or bronchiole completely surrounded by hyperplasia of BALT

1.- At least two structures are almost completely surrounded (80 %) by hyperplasia of BALT

or

2.- All structures of the section are affected

Interstitial pneumonia

1–2 lobule/s affected^a

50 % affected^a

All lobuli are affected^a

Suppurative pneumonia

1–2 lobule/s affected^a

50 % affected^a

All lobuli are affected^a

Fibrinous pleuropneumonia

1–2 lobule/s affected^a

50 % affected^a

All lobuli are affected^a

Pleurisy

Presence

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