I haven't had a I've sinus infection(s) or URI infection in a long time that I remember. Is that what causes opacity? I had terrible ones about 15 yrs ago. Can you explain "residual" (above) in more detail? Wishing for info that includes why I still have a stuffed nose? And why I would get laryngitis at this late date. I won't even see the ENT until the first week in October but if. I'll be able to see the CT and report before then.