Staphyloma (scleral ectasia) is a scleral genetic defect that is lined with uveal tissue.
Secondary staphyloma can also occur secondary to trauma, particularly penetrating scleral injuries which results in uveal extension into scleral defect.
Because of the bulging size of these lesions, secondary strabismus may develop.
A tentative diagnosis can be obtained with gonioscopy but a definitive diagnosis requires scleral biopsy and histological assessment of tissue samples.
Corrective debridement of the lesion is usually curative, with the deficit filled with a flap taken from Tenon’s capsule and conjunctiva.
Unusual surgical techniques have been reported, such as an homologous peritoneal graft.
- Grahn BH et al (2004) Veterinary Ophthalmology Essentials. Philadelphia: Butterworth Heinemann. pp:117–122
- Barros PS & Safatle AM (2000) Congenital scleral staphyloma in a dog repaired with preserved homologous peritoneum. Vet Ophthalmol 3(1):27-29