Table 1—

Chest radiograph classification at the time of serum sampling (disease onset or ≥2 yrs after diagnosis)

Chest radiographDisease onsetDisease ≥2 yrs
Acute onset (Löfgren's syndrome)Insidious onset
Stage 0001
Stage I731
Stage II402
Stage III002
  • Data are presented as n

  • Patients investigated at disease onset are sub-divided depending on initial symptoms

  • Stage 0: normal chest radiograph

  • stage I: bilateral hilar adenopathy (BHL) without parenchymal shadowing

  • stage II: BHL with parenchymal shadowing

  • stage III: parenchymal shadowing without BHL