Zdenek Pelikan, M.D., Ph.D., of Allergy Research Foundation, Breda, the Netherlands, studied 71 patients with chronic maxillary sinus disease and 16 control individuals with allergic rhinitis but ...

This X-ray of a human skull highlights the main nasal cavity (orange) and the sinuses: frontal (pink), ethmoid (yellow), maxillary (green) and sphenoid (purple). Asian apes do not have frontal or ...