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Table 2 HRCT scoring system according to Gay SE et al.*

From: R ole of interleukin 4 and its receptor in clinical presentation of chronic extrinsic allergic alveolitis: a pilot study

Score

Alveolar

Interstitial

0

No alveolar disease

No interstitial disease

1

GGO < 5%

Septal thickening, no honeycombing

2

GGO < 25%

HC/ septal thickening < 25%

3

GGO 25-49%

HC/septal thickening 25-49%

4

GGO 50-75%

HC/septal thickening 50-75%

5

GGO > 75%

HC/septal thickening > 75%

  1. Scored fields = peak of aortic arch, tracheal bifurcation, most prominent convexity of the right ventricle, and peak of the right cupola of diaphragm. Mean interstitial and alveolar scores were counted.
  2. GGO ground glass opacity, HC honeycombing.
  3. *[9].