Our expert says:
In your daughter's case she does not have fully developed sinusses, as this happens up to the age of twelve years. Children of this age have small maxillary sinusses, and they are usually filled with mucous at this stage. The "back" sinus could possibly refer to the sfenoid sinus, and this is also very small in a two year old. Sinus surgery is only limited in this agegroup to perhaps a sinus washout, but generally the effect is limited, and the solution not longterm. You should evalute her position again with your ENT and Paediatrician, in order to find a longterm solution.
It may be that you should change her nasal spray, and that her asthma medication needs adjustment, as uncontrolled asthma could be the cause of her coughing.
I agree that surgery at this stage is not advisable so a more conservative approach may be indicated at present.
Surgery should only be the last resort.
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