Intraosseous Hemangioma of the Ethmoid Sinus: A Case Report.

Intraosseous hemangiomas usually occur in the vertebrae and skull bones, whereas those arising within the nasal cavity are exceedingly rare. Here, we describe the case of a 40-year-old woman with nasal congestion who presented to our hospital with a tumor located in the left nasal cavity. Unenhanced paranasal computed tomography revealed an approximately 3 cm large mass originating from the anterior wall of the ethmoid sinus. Pre-operative imaging failed to reveal the etiology of the mass. The tumor was successfully resected using a trans-nasal endoscopic approach without pre-operative embolization. No complications occurred during the post-operative period, and there was no evidence of recurrence at the 3-month and 6-month follow-up. Histological examination of the resected specimen showed endothelium-lined blood-filled vascular spaces within the bony trabecule, suggesting a pattern typical of intraosseous cavernous hemangioma. Thus, although intraosseous hemangiomas of the nasal cavity are extremely rare, they must be considered when a bony mass is detected in the nasal cavity.