Pediatric Radiology

2.5 Years

3 Years

3.5 Years

4 Years

4.5 Years

5 Years

5.5 Years

6 Years

7 Years

8 Months

8 Years

9 Years

10 Months

10 Years

11 Years

12 Months

12 Years

13 Years

14 Months

14 Years

15 Years

16 Months

16 Years

17 Years

18 Months

18 Years

20 Months

28 Months

Normal Common Bile Duct Diameter on Cholangiography

Reference values for normal common bile duct maximal diameter on cholangiography in children aged 0–14 years, based on Witcombe & Cremin 1978.

Normal Filum Terminale Size on Ultrasound and MRI

Normal filum terminale diameter is less than 2 mm on ultrasound and MRI; values at or above this threshold suggest a thickened filum and possible tethered cord.