Chest computed tomography (CT) scan features at the time of diffuse idiopathic pulmonary neuroendocrine cell hyperplasia diagnosis (n=44)

Bilateral nodules42 (95)
Mosaic attenuation34 (77)
Lymphadenopathy4 (9)
Interstitial fibrosis4 (9)
Emphysema2 (5)
Pleural effusion1 (2)
Nodule size on follow-up chest CT when performed (n=36)
 Follow-up interval months31.5 (12.5–52.4)
 Enlarged24 (67)
 Stable12 (33)
Size of largest nodule/mass on chest CT based on presence/absence of carcinoid tumour on biopsy mm
 Carcinoid tumour found on biopsy17 (11–22)
 No carcinoid tumour on biopsy5 (5–7)

Data are presented as n (%) or median (interquartile range).