Why is it called sounding?

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Tags

1. #infection
2. #medical
3. #because
4. #sound
5. #called
6. #physicians
7. #narrowing
8. #relieve
9. #difficulty
10. #usually
11. #leads
12. #ureter
13. #which
14. #persons
15. #scarring
16. #device
17. #previous
18. #urinating