Hello and thank you for posting your query on HCM
pansinusitis refers to inflammation of all four sets of sinuses
inhead- maxillary sinus, behind the cheek; frontal sinus- in forehead; ethmoid sinuses and sphenoid
Due to inflammation there is swelling of the lining mucosa due to congestion which leads to hypertrophy.
the swelling of mucosa near the ostia ie opening of the sinuses causes retention o secretions. These secretions are secreted by the mucus glands in the sinus lining.
I hope you are satisfied by my answer.
thanks and take care