MRI findings

Number (n)

Percentage (%)

Tumor location

Above S3

0

0%

Below S3

7

100%

Tumor Size (cm)

Range: 5.9 cm; Mean: 2.8 - 10.5 cm

Involvement of surrounding structures

4

57.1%

Tumor morphology

Cystic

6

85.7%

Solid

1

14.3%

Signal intensity

Homogeneity

7

100%

Heterogeneity

0

0%

Tumor margin

Sharp

7

100%

Irregular/Infiltrative

0

0%

Gadolinium enhancement

3

42.9%

Septation

Unilocular

3

42.9%

Polylocular

4

57.1%

Preferable diagnosis

Tailgut cyst

5

71.4%

Chordoma

1

14.3%

Endometriosis

1

14.3%