Orbitoethmoid aneurysmal bone cyst. Case report and literature review.

Aneurysmal bone cyst is a benign, vascular, variable growing and expansive lesion that can occur in any part of the skeletal system, but mainly in long bones and vertebrae. We present a case of orbitoethmoid aneurysmal bone cyst in a 62-year-old female presenting epiphora. Nasal endoscopy was normal. Sinus CTscan revealed an expansive mass in the right ethmoid sinus extending and destroying the right lamina papiracea. The tumor was completely resected through paralateral rhinotomy. Histological analysis showed fibrous septa containing multinucleated giant cells and bone tissue surrounding blood vessel lumens, bordered by endothelial cells. These findings are characteristic of aneurysmal bone cysts. After 30 months of postoperative follow-up the patient remains disease-free and asymptomatic.