en Surgery Surgery Short Communication Short Communication <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="line-height:14pt"><b><i><span style="color:blue">Background:</span></i></b> Hyperostosis is a common consequence of chronic rhinosinusitis with nasal polyps (CRSwNP) and other chronic rhinosinusitis, affecting mainly structures of the ethmoid labyrinth, frontal and maxillary sinuses. These neo-bones are found in advanced stages of rhinosinusitis causes exacerbation because of ostia outflow blockage. Frequent relapses of the disease due to hyperostosis restenosis, represent a problem in the treatment of chronic frontal sinusitis. We report our cases experience about the treatment of frontal chronic sinusitis because of frontoethmoidal area hyperostosis, treated by modified lothrop procedure, achieving sufficient clinical effect.</span><br> <span style="line-height:14pt"><b><i><span style="color:blue">Case Presentation:</span></i></b> A 52-year-old female (CRSwNP) with right side frontoethmoidal area totally obstructed by <span style="background:lime"><span style="background-color:#ffffff;">25 &times; 15 &times; 10</span></span><span style="background-color:#ffffff;"> mm bony mass, with total opacification of the right frontal and left maxillary sinuses, right frontal sinus anterior wall defect. A 63-year-old male (CRSwNP) with a </span><span style="background:lime"><span style="background-color:#ffffff;">23 &times; 10 &times; 10</span></span> mm bony mass arising from the right frontoethmoidal area which causes total opacification of the right frontal sinus, inferior and posterior sinus wall defect.</span><br> <span style="line-height:14pt"><b><i><span style="color:blue">Conclusion:</span></i></b><b> </b>Modified lothrop procedure is a method of choice for frontoethmoidal bone hyperostosis surgery to be performed endoscopically. Endoscopy provides excellent visualization of anatomy and a better approach to bone hyperostosis zone.<b><i><span style="color:#0033cc"></span></i></b></span></span></span><br> &nbsp;</div> Draf3, modified Lothrop procedure, chronic rhinosinusitis, frontoethmoidal area hyperostosis, hyperostosis staging 746 750 http://caspjim.com/browse.php?a_code=A-10-2777-1&slc_lang=en&sid=1 Maksim Aflitonov maksim-aflitonov@yandex.ru 100319475328460044978 100319475328460044978 Yes Immanuel Kant Baltic Federal University, Kaliningrad, Russia Aleksei Voronov voronovdoc@mail.ru 100319475328460044979 100319475328460044979 No Saint-Petersburg Research Institute of Ear, Throat, Nose and Speech, Saint-Petersburg, Russia Vladimir Dvoryanchikov spbniilor@gmail.com 100319475328460044980 100319475328460044980 No Saint-Petersburg Research Institute of Ear, Throat, Nose and Speech, Saint-Petersburg, Russia Sergei Artyushkin Sergei.Artyushkin@szgmu.ru 100319475328460044981 100319475328460044981 No North-Western State Medical University named after I.I. MechnikovNorth-Western State Medical University named after I.I. Mechnikov Evgeniyav Bezrukova Evgeniya.Bezrukova@szgmu.ru 100319475328460044982 100319475328460044982 No North-Western State Medical University named after I.I. Mechnikov, Saint-Petersberg, Russia