Are urethral polyps life-threatening (malignant)?
No. These are benign growths (not cancer). But all surgically removed polyps are sent for biopsy to make sure.
When should we start treatment for meatal stenosis?
Meatal stenosis isn't an emergency. But you should take care of it as soon as it's found.
Do all urethral duplications need surgery?
Surgery is needed only in certain cases. One case is when there's also a curved penis causing 2 urinary streams. Surgery for this problem is fairly simple.