Ophthalmomyiasis externa in a puppy due to Cuterebra infestation.

An 8 wk old Scottish terrier was evaluated for a 2×2 cm mass located directly adjacent to the lateral canthus of the right eye. Examination revealed a well-developed Cuterebra larva at the lateral aspect of the orbital cavity, anchored at the lateral canthus. The larva was manually removed under general anesthesia, and the eyelid margin was repaired. Systemic and topical antibiotics along with systemic anti-inflammatory treatment were instituted. The lesion healed completely, revealing a normal functional right eye 10 days after removal of the Cuterebra larva. Careful manual removal of the larva is recommended along with correction of any resultant conformational defects. The remaining cavity can be left to heal; however, antibiotic therapy is recommended.