The Sphenoid Sinus is considered the paranasal sinus with more variation to the degree of pneumatization. Thus, this work aimed report to the first case on the interference of this anatomical variation for orthognathic surgery. A 18- year-old woman, with isolated cleft palate repaired, was submitted to orthognathic surgery to correct the maxillomandibular skeletal discrepancy. The cone beam computed tomography (CBCT) exam performed for preoperative planning showed a great extension for the adjacent structures, with proximity to the posterior wall of the maxillary sinus and pterygomaxillary fissure bilaterally. The postoperative CBCT image evidenced the compromise of the sinus floor due to the factors related to the transoperative period. This case, along with literature review, highlighted the importance of identifying sphenoid sinus variation in CBCT exams prior to orthognathic surgery, in order to avoid serious complications for the patient, such as sinus infections; hemorrhages; mucocele formation or intracranial involvement.
especialização, professores, técnicos e funcionários pela disposição e auxílio na coleta dos dados da pesquisa, ensinamentos e amizade. À Pós-Graduação, em nome da Presidente Dra. Ana Paula Fukushiro e seus funcionários, pelos atendimentos prestados e carinho. Ao Serviço de Apoio ao Ensino Pesquisa e Extensão e Comitê de Ética em Pesquisa em Seres Humanos do HRAC (CEP-HRAC), em nome de seus funcionários, pelo auxílio na elaboração do trabalho. À Flávia Maria Ravagnani Neves Cintra pelo auxílio na análise estatística. Às futuras Radiologistas: Natalia, Thais, Alexandra e Milenka pelo carinho, respeito e amizade diária.
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