How is treatment different after surgery?

It doesn't mean that you won't get sinusitis any more, but it is often easier to treat.

Surgery is not meant to cure the disease.

Once the sinuses have been opened up by surgery, it is possible to wash out the sinuses if necessary , and as a result, sometimes oral antibiotics don't have to be used.

It is often possible to do an endoscopy and find out exactly where the cause of the problem is, since it is possible to examine the inside of the sinuses once surgery has been done.

Elsewhere on this website, there is a section on treatment of sinusitis after surgery.