paediatrics Brussels 17

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Thecal Sac Termination

Radiologic (MRI)

Vertebral level

Frequency

S1

4 (17%)

Upper S2

3 (13%)

Mid S2

2 (8%)

Lower S2

7 (29%)

Upper S3

5 (21%)

Mid S3

1 (4%)

Lower S3

1 (4%)

S4

1 (4%)

Cadaveric Study

Dunbar SF et al. Int J Radiat Oncol Biol Phys 1993;

26:669-73

Vertebral level

Frequency

Mid S1

2 (7%)

Lower S1

1 (4%)

S1-S2

7 (26%)

Upper S2

1 (4%)

Mid S2

5 (19%)

Lower S2

2 (7%)

S2-S3

6 (22%)

Upper S3

1 (4%)

Mid S3

1 (4%)

S3-S4

1 (4%)

Hansasuta A et al. Pediatr Neurosurg 1999; 30:176-9