Table 1 Comparison of CT image features between PSP and APLC

Maximum diameter (cm)

1.9 ± 0.7

2.1 ± 0.6

-1.741^b

Shape

 Round or oval

37

28

4.874^a

 Irregular

11

22

Plain CT value (HU)

31.7 ± 11.6

30.4 ± 12.5

0.538^b

CT value of the arterial phase (HU)

72.1 ± 20.7

53.4 ± 18.6

4.704^b

CT value of the venous phase (HU)

76.9 ± 19.8

60.5 ± 17.9

4.284^b

Degree of enhancement

 Mild

4

15

13.551^a

 Moderate

14

21

 Obvious

30

14

Mode of enhancement

 Uniform

25

22

0.641^a

 Uneven

23

28

Air gap

7

3

1.144^a

Welt vessel sign

27

22

1.470^a

Halo sign

6

5

0.154^a

Calcification

14

4

7.318^a

Lobular sign

10

24

7.977^a

Liquefaction necrosis

4

7

0.789^a

Cavity

1

4

0.760^a