Conservative therapy for chronic polyposis rhinosinusitis are well covered, and modern endoscopic rhinosurgery can effectively cope with this pathology. Clinical cases of large destructive anthrochoanal polyps are not uncommon, the pathology is well studied. However, cases with giant sinonasal polyposis, which lead to bone-destructive changes in the bones of the nose and the walls of the paranasal sinuses are very rare. We found only one case similar to the clinical observation presented in this article.