Table 2.
Summary of clinical and histopathological characteristics of renal tumours among 33 patients with Birt-Hogg-Dubé
| Characteristics | Number of patients | |
|---|---|---|
| Gender | Male | 21 |
| Female | 12 | |
| Tumour number | 1 | 20 |
| 2 | 4 | |
| Multifocal | 9 | |
| Tumour histology | Oncocytoma/Chromophobe/Hybrid chromophobe- oncocytoma | 23 |
| Clear cell | 3 | |
| Papillary (type undetermined) | 1 | |
| Undifferentiated | 1 | |
| N/A | 5 | |
| Extra-renal manifestations § | Lung cysts/pneumothorax | 22 |
| Fibrofolliculomas | 19 | |
| None | 4 |
§twelve patients had both pulmonary and dermatological manifestations. RCC, renal call carcinoma.