Mucoceles are cystic masses that generally affect the sinuses. It occurs as a result from obstruction of the ostium of a sinus and consequential accumulation of mucus. Frontal and ethmoid sinuses are mostly affected. Usually, the clinical symptoms are insidious, varying with the extent of the affected region. The treatment is surgical and endoscopic surgery is the method of choice in most cases. The present study is aimed at describing the main characteristics of paranasal sinuses mucoceles, demonstrating and illustrating a series of atypical presentations with emphasis on imaging findings. Keywords: Paranasal sinuses; Mucocele; Presentation; Atypical.As mucoceles são formações císticas que podem afetar os seios paranasais. Ocorrem quando há obstrução na drenagem de um seio, com resultante acúmulo de secreção. Os seios frontal e etmoidal são os mais acometidos. A apresentação clínica normalmente tem sintomas insidiosos que variam com a extensão da região acometida. O tratamento é cirúrgico, sendo a cirurgia endoscópica o método de escolha na maioria dos casos. O objetivo do nosso estudo é descrever as principais características das mucoceles dos seios paranasais, bem como demonstrar e ilustrar uma série de apresentações atípicas, com ênfase nos achados de imagem. Unitermos: Seios paranasais; Mucocele; Apresentação; Atípica. AbstractResumo
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