This retrospective study was, to our knowledge, the largest ever reported in the literature. This series confirmed the risk factor of this lesion as well as the lesion's influence on the survival rate. Surgery is the most important part of the treatment. Local recurrences were responsible for the poor prognosis of this lesion.

Osteomas are diagnosed incidentally in asymptomatic patients. Our case was symptomatic and raised the question of surgical management. This article discusses the presentation and management associated with this exceptional osteoma location.

Sinonasal mucosal melanomas are rare tumors with a high mortality rate. Treatment of these tumors requires extensive surgical treatment associated with external radiotherapy.

The transnasal transostial surgical approach is a safe and effective procedure for the treatment of isolated sphenoid sinusitis. However, the recurrence rate due to postoperative closure of the sphenoidotomy observed in our series raises the question of postoperative maintenance of a patent and functional sphenoidotomy.

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