orbital osteoma presenting as epiphora

A 14-year-old boy presented with a four-months history of epiphora in his left eye. Clinical examination revealed a hard palpable mass in the upper-inner quadrant of the left orbit, laterally displacing the medial palpebral ligament. Orbital radiography, computed tomographic scan, and dacryocystography confirmed the presence of an osteoma of the anterior ethmoidal cells causing impaired drainage of left lacrimal passages. Surgical excision of the osteoma restored the patency of the impaired lacrimal passages, as confirmed by postoperative dacryocystography