Hi Thank you for asking HCM I have gone through your query. Poly sinusitis is the inflammation of multiple sinuses at one time. The other term we use commonly for this is pan sinusitis. Usual sinus which is affected commonly is maxillary sinuses on both sides of nose. But others like frontal, sigmoidal and ethmoidal sinuses can be affected at same time also. Irrigation of sinuses , using nasal decongesants , anti inflammatory drugs and antibiotics helps in such case. If that is not helping then endoscopic examination and correction might help. In some cases surgery will be needed. Hope this may help you. Let me know if anything not clear. Thanks.