Table 3 Histopathological features in cases of diffuse idiopathic pulmonary neuroendocrine cell hyperplasia.
| Histopathological features | Group 1 | Group 2 | Total |
|---|---|---|---|
| Neuroendocrine cell hyperplasia | 9/9 | 10/10 | 19/19 |
| Tumourlets | 9/9 | 10/10 | 19/19 |
| Typical carcinoid | 4/9 | 5/10 | 9/19 |
| Atypical carcinoid | 0/9 | 3/10 | 3/19 |
| Bronchiolitis | 9/9 | 10/10 | 19/19 |
| Obliterative bronchiolitis | 7/9 | 7/10 | 14/19 |
| Peribronchial fibrosis | 6/9 | 8/10 | 14/19 |
| Bronchiolectasis | 4/9 | 1/10 | 5/19 |
| Mucus plugging | 5/9 | 4/10 | 9/19 |
| TTF‐1 staining of NEH/TL cells | 5/5 | 6/6 | 11/11 |
| TTF‐1 staining of TC | N/A | 3/3 | 3/3 |
| TTF‐1 staining of AC | N/A | 2/2 | 2/2 |
AC, atypical carcinoid; NE, neuroendocrine; NEH, neuroendocrine cell hyperplasia; TC, typical carcinoid; TL, tumourlet; TTF‐1, thyroid transcription factor‐1.