Figure 14-17 Fibro-osseus dysplasia (ossifying fibroma). Spicules of lamellar bone are set in a cellular fibrous stroma. Note the osteoblasts (arrows) lining the bony spicules. (Courtesy of Tatyana Milman, MD.)

The lacrimal gland is situated anteriorly in the superotemporal quadrant of the orbit. The gland is divided into orbital and palpebral lobes by the aponeurosis of the levator palpebrae superioris muscle. The acini of the glands are composed of low cuboidal epithelium. The ducts, which lie within the fibrovascular stroma, are lined by low cuboidal epithelium with a second outer layer of low, flat myoepithelial cells. See BCSC Section 2, Fundamentals and Principles of Ophthalmology, and Section 7, Orbit, Eyelids, and Lacrimal System, for additional discussion.

Congenital Anomalies

Dermoid and Other Epithelial Cysts

The major categories of orbital cysts of childhood include cysts of the surface epithelium, teratomatous cysts, neural cysts, secondary cysts (mucocele), inflammatory cysts (parasitic), and noncystic lesions with a cystic component. Congenital cysts of the surface epithelium are subdivided into dermoid cysts and simple epithelial (epidermoid) cysts. Dermoid cysts are the most common and