Table 1. Known risk factors for pneumothorax following percutaneous lung biopsy and their effect on the pneumothorax rate.

Pneumothorax risk	Pneumothorax rate (%)
Size <2 cm	33-60
Lesion depth >4 cm	14-32
Experienced radiologist	17
Inexperienced radiologist	30
Imaging findings of chronic obstructive pulmonary disease	47