This medical phrase means that you have a chronic sinus infection. Your maxillary paranasal air sinuses are inflamed and narrowed which is what is making it difficult to breathe and clear the nose of mucus.
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The mild ethmoid sinus mucosal thickening refers to the swelling of the nasal tissues.
Mucoperiosteal thickening of the maxillary sinus is a disease of the sinuses. It is caused by a build up of secretions and is usually diagnosed by carrying out a nasal endoscopy.