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Table 3: Imaging findings of CXPA
Total Invasive Noninvasive P Value OR 95% CI
Border 
 Totally ill-defined 2 2 0 .002 14.41 (2.23–171.2)^{^a}
 Partially ill-defined 19 17 2
 Well-defined 16 6 10
Capsule 
 None 9 9 0 <.001 38.18 (4.06–1956.7)^{^b}
 Partial 12 11 1
 Total 16 5 11
Corona sign on FS-T2WI 
 Present 21 19 2 .001 14.40 (2.23–171.2)
 Absent 16 6 10
Corona sign on CE-FS-T1WI^{^c} 
 Present 22 19 3 .007 9.31 (1.55–76.4)
 Absent 13 5 8
Black ring sign 
 Present 15 14 1 .011 13.11 (1.49–642.2)
 Absent 22 11 11
↵a These ORs and 95% CIs were calculated between the 2 groups as well-defined versus totally ill-defined and partially ill-defined.
↵b These ORs and 95% CIs were calculated between the 2 groups as none and partial versus total.
↵c Two cases lacked contrast-enhanced images.

	Total	Invasive	Noninvasive	P Value	OR 95% CI
Border
Totally ill-defined	2	2	0	.002	14.41 (2.23–171.2)^{^a}
Partially ill-defined	19	17	2	.002	14.41 (2.23–171.2)^{^a}
Well-defined	16	6	10
Capsule
None	9	9	0	<.001	38.18 (4.06–1956.7)^{^b}
Partial	12	11	1	<.001	38.18 (4.06–1956.7)^{^b}
Total	16	5	11
Corona sign on FS-T2WI
Present	21	19	2	.001	14.40 (2.23–171.2)
Absent	16	6	10
Corona sign on CE-FS-T1WI^{^c}
Present	22	19	3	.007	9.31 (1.55–76.4)
Absent	13	5	8
Black ring sign
Present	15	14	1	.011	13.11 (1.49–642.2)
Absent	22	11	11