limbal dermoid
Benign choristoma containing keratinized epithelium and hair follicles, typically located at the inferotemporal limbus.
Full Definition
Limbal dermoid is a developmental choristoma consisting of keratinized squamous epithelium with dermal appendages including hair follicles, sebaceous glands, and sometimes cartilage or fat. These benign lesions most commonly arise at the inferotemporal limbus and appear as elevated, white-yellow masses that may contain visible hairs. Dermoids can cause mechanical ptosis, induced astigmatism, or cosmetic concerns, and larger lesions may extend into the cornea causing visual obstruction. While not malignant, surgical excision may be indicated for functional or cosmetic reasons. The presence of hair follicles and keratin distinguishes dermoids from epidermoid cysts, and their limbal location differentiates them from conjunctival dermoids.
Usage
Usage note: Specify anatomical location as dermoids can occur at various ocular sites.
In Context
- "The limbal dermoid contained multiple hair follicles and induced significant astigmatism in this pediatric patient." — Pediatric consultation note
- "Histopathology of the excised limbal dermoid showed keratinized epithelium with sebaceous glands." — Pathology report