Pathological finding

Benign (Group 1 + 3) (n = 29)

Malignant (Group 2) (n = 16)

Maximum diameter (mm) (mean ± SD)

9.8 ± 6.1

(2-30)

23.6 ± 19.7

(8-94)

Shape

Papillary

9

11

Rounded

20

5

Signal intensity

T1-weighted image

Hyperintense

2

0

Isointense

0

0

Hypointense

27

16

T2-weighted image

Hyperintense

9

14

Isointense

0

0

Hypointense

20

2

Post contrast study

enhancement

22

(75.9%)

16

(100%)

Attached angle of mural nodules to cyst wall (degree, mean ± SD)

mean ± SD

77.2 ± 34.8

(24-146.6)

80.9 ± 24.7

(37.8-12.2)

Obtuse (>90 degrees)

15

5

Acute (<90 degrees)

14

11