Two unrelated pet guinea pigs with conjunctival dermoids and a history of ocular problems were referred for treatment. Dermoids are congenital skinlike lesions observed in guinea pigs, other mammals, and some birds in various ocular locations, such as the lids, conjunctiva, cornea, or inclusion cysts within the orbit. These growths consist of stratified squamous keratinized epithelium overlying an irregular dermis with hair follicles, sweat glands, sebaceous glands, and adipose tissue (cartilage and bone are rarely seen) that can be irritating or obscure vision. Simple surgical resection, superficial lamellar keratectomy (in case two), and corneal epithelial debridement was done to correct the defect. Antibiotic ointment was administered postoperatively twice daily for 5 days and minimal scarring was apparent after 1 week.

COMMENTARY: Simple resection with keratectomy and corneal debridement may be a worthwhile treatment in guinea pigs with conjunctival dermoids, improving vision and resolving irritation at an acceptable cost.

Conjunctival dermoid in two guinea pigs: A case report. Wappler O, Allgoewer I, Schaeffer EH: Vet Ophthal 5:245-248, 2002.