Prevalence and Characteristics of Lung Involvement on High Resolution Computed Tomography in Patients with Ankylosing Spondylitis: A Systematic Review

Table 2

Prevalence of thoracic HRCT abnormalities in patients with AS according to disease duration.

Disease duration	<5 yrs	5–10 yrs	>10 yrs	P
Number of patients at risk	50	18	23
Ground glass attenuation	9 (18)	2 (11.1)	4 (17.3)	0.855
Upper lobe fibrosis	3 (6)	2 (11.1)	5 (21.7)	0.049
Brochiectasis	9 (18)	1 (5.5)	5 (21.7)	0.881
Emphysema	11 (22)	3 (16.6)	8 (34.7)	0.309