Table 2. Characteristics on chest computed tomography scans.

	BHD (n = 6)	Non-BHD (n = 11)	P-value
Number of cysts			0.728
< 20	0 (0.0%	2 (18.2%)
20–40	0 (0.0%)	1 (9.1%)
41–100	4 (66.7%)	7 (63.6%)
> 100	2 (33.3%)	1 (9.1%)
Dominant location			0.549
Central dominant	1 (16.7%)	0 (0.0%)
Evenly distributed	2 (33.3%)	5 (45.5%)
Peripheral dominant	3 (50.0%)	6 (54.5%)
Size of cysts (mm)
Median value of minimum size (IQR)	3.7 (2.1)	4.0 (1.20)	0.537
Median value of maximum size (IQR)	39.4 (11.4)	15.8 (7.8)	0.001*
CPA involvement			0.515
No	4 (66.7%)	10 (90.9%)
Yes	2 (33.3%)	1 (9.1%)
Multiseptated cyst			0.110
No	4 (66.7%)	11 (100.0%)
Yes	2 (33.3%)	0 (0.0%)
Variable morphology			0.002*
No	0 (0.0%)	9 (81.8%)
Yes	6 (100.0%)	2 (18.2%)

*P < 0.05, Mann-Whitney U test and Fisher’s exact test.

Abbreviations: BHD, Birt-Hogg-Dube syndrome; IQR, interquartile range; CPA, costophrenic angle.