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Describe a novel treatment approach to a rare bony neoplasm in the frontal sinus.Case report.Retrospective chart review of an osteoblastoma of the frontal sinuses complicated by a right orbital mucocle. Demographic, endoscopic, radiographic, pathologic, and surgical data were collected for synthesis and review. MEDLINE, Embase, and Cochrane databases were searched from 1977 to 2017 to review publications of surgical management of frontal sinus neoplasms.A single female patient with a large frontal sinus osteoblastoma was successfully treated with a bilateral transorbital and transnasal approach. The right orbital mucocele was marsupialized into the frontal sinus. Gross total resection of the tumor was achieved, with complete resolution of the presurgical morbidity. The surgery was tolerated well without iatrogenic injury or sequela.Frontal sinus osteoblastoma is a rare condition. Complete surgical excision is considered curative. Various endoscopic and open approaches have been described. Here we show the feasibility and efficacy of a multiportal strategy in the successful management of a large frontal sinus osteoblastoma complicated by a right orbital mucocele.