Ocular complications of persistent hyperplastic primary vitreous in three dogs

Posterior lens capsule rupture in non-diabetic canine cataracts: Pre-operative, intra-operative, and post-operative findings

PURPOSE

To describe clinical features of non-diabetic canine cataracts with presumed pre-existing posterior capsule rupture (PLCR) and their surgical outcomes.

METHODS

Clinical records of 497 non-diabetic canines that underwent elective cataract surgery were reviewed. Twelve canines met the inclusion criteria indicative of PLCR pre-dating surgery.

RESULTS

The incidence of presumed pre-existing PLCR was 12/497 (2.4%). Cataracts included were unilateral in 10 out of 12 canines (83.3%) and bilateral in the remaining two (16.7%). Four eyes (28.6%) had clinically detectable pre-operative lens-induced uveitis. The mean age at cataract diagnosis for cases included was 6.6 years, and golden retrievers were the most common breed affected (28.6%). Phacoemulsification surgery was performed at a median time of 110 days (range 17-403 days) after presentation. Pre-existing PLCR was found intra-operatively as a large ellipse spanning the posterior capsule from equator to equator centrally in 12 eyes and peripherally in two eyes. The capsular defect in all eyes with PLCR incorporated a distinct "pseudo-capsule" preventing vitreal presentation and ruling out intraoperative surgeon rupture. Ten eyes (71.4%) received an intraocular lens implant (IOL), and 13 eyes (92.9%) maintained vision throughout a mean follow-up period of 12 months.

CONCLUSION

Posterior lens capsule rupture of blunt trauma origin and associated cataract formation, as reported in humans, may also be an infrequent but distinct cause of some cases of non-diabetic canine cataracts. Medical management of phacolytic uveitis and delayed phacoemulsification surgery may be beneficial by allowing time for "pseudo-capsule" development, increasing the likelihood of IOL placement and improved visual outcomes.

Ocular Ultrasound Abnormalities and Optic Nerve Sheath Diameter in Dogs and Cats

Indications for, technique, and findings for normal and abnormal ocular ultrasound are discussed, with specific sonographic findings, images, differential diagnoses, and other considerations. Because the eye is a fluid-filled structure, ultrasound can be used as a screening test when pathology prevents direct examination. Structural abnormalities, such as lens luxation, retinal detachments, and intraocular and orbital masses, also may be defined better using point-of-care ultrasound. Details on additional ophthalmic diagnostics, treatment, and prognosis are not covered.

Congenital ocular malformations in dogs and cats: 123 cases

OBJECTIVE

Provide epidemiological data regarding the prevalence of congenital ocular malformations in dogs and cats.

ANIMALS STUDIED

A population of 32 974 dogs and 13 977 cats that presented for consultation at the veterinary teaching hospital.

PROCEDURES

Medical records from 2011 to 2018 were reviewed. A retrospective and prospective epidemiological clinical study addressing congenital ocular malformations was conducted. Signalment, medical history, reason for presentation, clinical findings, vision impairment, and treatment options were analyzed.

RESULTS

From the total of cases analyzed, 103 dogs (0.3%) and 20 cats (0.1%) met the inclusion criteria. The majority of dogs were mixed breed, the most common breed being the French Bulldog, while the majority of cats were European domestic shorthair. The median age of diagnosis was 12 months for dogs and 6 months for cats. Sex predisposition was not found. The most frequently identified abnormalities were as follows: congenital cataract (dogs: 31.1%; cats: 30.0%), microphthalmia (dogs: 35.0%, cats: 25.0%), and persistent pupillary membrane (dogs: 27.2%, cats: 40.0%). Some of the concurrently observed malformations were significantly associated. A statistically significant association was found between ocular dermoids and the French Bulldog breed (P < .001).

CONCLUSIONS

Even though congenital ocular malformations are uncommon, knowledge about their prevalence is important, since they can cause vision impairment or even blindness. Moreover, some human ocular disease phenotypes are similar to the ones presented by dogs and cats, so they can be used as models to investigate pathophysiology and therapeutic approaches.

Phacoemulsification for Cataract Secondary to Persistent Hyperplastic Tunica Vasculosa Lentis and Peristent Hyperplastic Primary Vitreous in a Welsh Corgi

A 7-month-old Cardigan Welsh Corgi was presented with rapid cataract formation. Slit lamp biomicroscopy revealed mature cataract in the left eye. Ultrasonography revealed a microphakic lens and the presence of a cord-like structure extending from the posterior lens to the optic disc. On the basis of ophthalmological examinations, a diagnosis of cataract secondary to persistent hyperplastic tunica vasculosa lentis and persistent hyperplastic primary vitreous was made. Routine phacoemulsifi cation with a capsular tension ring and intraocular lens implantation were performed. Although a blood-fi lled vasculature with focal hemorrhage was observed during surgery, we did not fenestrate the posterior capsule or cut the hyaloid artery. We only polished the posterior capsule carefully for 2 min. At 22 days after surgery, Doppler ultrasonography did not detect blood fl ow within the cord-like structure, and the implanted intraocular lens appeared clear without fi brin formation or posterior capsule opacifi cation. The fi ndings from this case suggest that routine cataract surgery is an optimal surgical treatment for persistent hyperplastic tunica vasculosa lentis and persistent hyperplastic primary vitreous. To the best of our knowledge, this is the fi rst case report of phacoemulsifi cation with intraocular lens implantation for persistent hyperplastic tunica vasculosa lentis and persistent hyperplastic primary vitreous in a Welsh Corgi.

Intraocular sarcoma associated with lens capsule rupture and persistent hyperplastic primary vitreous in a dog

This case report describes the clinical findings and ocular pathology in an adult Golden Retriever diagnosed with an intraocular sarcoma. Nineteen s prior to diagnosis with a lens capsule rupture and intraocular sarcoma, the dog was diagnosed with persistent hyperplastic primary vitreous and uveitis based on clinical signs and the ultrasonographic appearance of the eye. Two years after enucleation, there was no evidence of metastatic spread of the sarcoma. The immunohistochemical characteristics of the tumor as well as the limitations and supportive evidence used in attempting to identify the histogenesis of the tumor are outlined.

Congenital cataract associated with persistent hyperplastic primary vitreous and persistent tunica vasculosa lentis in a sambar deer (Rusa unicolor) - clinical, ultrasonographic, and histological findings

Ultrasonography suggested the diagnosis of cataract associated with persistent fetal intraocular vasculature in a 26-day-old sambar deer. The deer was ill and died despite intense critical care. Globes were removed. Histological characteristics of persistent fetal vasculature and secondary cataract are reported expanding the knowledge of ophthalmic disorders in wild ungulates.

Unilateral Subconjunctival and Retrobulbar Hemorrhage Secondary to Brodifacoum Toxicity in a Dog

An 8-year-old spayed female mixed-breed dog was presented for an acute onset of bleeding around the left eye. Mild exophthalmos and massive subconjunctival hemorrhage on the globe and nictitating membrane were present in the left eye. Retrobulbar hemorrhage was suspected, and pain was implied on opening of the mouth because the patient resisted and vocalized. No other abnormalities were found on ophthalmic or physical examination. Further questioning of the owner confirmed potential brodifacoum ingestion, and prothrombin time and partial thromboplastin time were both markedly elevated. Treatment with oral vitamin K1was implemented, and the subconjunctival hemorrhage was significantly improved within a few days of instituting treatment. All clinical signs of coagulopathy were completely resolved within 4 weeks of presentation. Coagulopathy secondary to brodifacoum ingestion can manifest as severe unilateral bulbar and nictitating membrane subconjunctival hemorrhage and exophthalmos due to retrobulbar hemorrhage without other clinical signs.

Surgical management and histologic and immunohistochemical features of a cataract and retrolental plaque secondary to persistent hyperplastic tunica vasculosa lentis/persistent hyperplastic primary vitreous (PHTVL/PHPV) in a Bloodhound puppy

The objective of this study was to describe the clinical, histologic and immunohistochemical features, the surgical treatment, and outcome of a cataract secondary to persistent hyperplastic tunica vasculosa lentis/persistent hyperplastic primary vitreous (PHTVL/PHPV) in a dog. A 4-month-old male Bloodhound dog presented for evaluation of a cataract. A complete ophthalmic examination and ocular ultrasonography were performed. A resorbing cataract with intralenticular hemorrhage, lens induced uveitis, and PHTVL/PHPV were diagnosed. Extracapsular cataract extraction using phacoemulsification was performed. A primary posterior capsulectomy was performed to remove a retrolental plaque with the posterior capsule; the excised plaque was submitted for histopathology and immunohistochemical staining. A 41-Diopter intraocular lens (IOL) was implanted. Functional vision was maintained postoperatively during the 21-month follow-up period. Histologically, the posterior capsule was coiled and exhibited duplication. The retrolental plaque was comprised of dense fibrous connective tissue, blood vessels, free red blood cells, hemosiderin-laden macrophages, a pocket of neural tissue and numerous perivascular mast cells. With immunohistochemical staining, the neural elements were determined to be glial cells compatible with astrocytes. Cataract secondary to PHTVL/PHPV can be successfully treated using phacoemulsification and planned posterior capsulectomy. Posterior lens capsule duplication, mast cells and astrocytic glial cells may be normal components of the fibrovascular retrolental plaque associated with PHTVL/PHPV.

Inherited retinal dysplasia and persistent hyperplastic primary vitreous in Miniature Schnauzer dogs

The objectives of this study were to define the clinical syndrome of retinal dysplasia and persistent primary vitreous in Miniature Schnauzer dogs and determine the etiology. We examined 106 Miniature Schnauzers using a biomicroscope and indirect ophthalmoscope. The anterior and posterior segments of affected dogs were photographed. Four enucleated eyes were examined using routine light microscopy and scanning electron microscopy. A pedigree was constructed and related dogs were test-bred to define the mode of inheritance of this syndrome. Congenital retinal dysplasia was confirmed in 24 of 106 related Miniature Schnauzer dogs. Physical and postmortem examinations revealed that congenital abnormalities were limited to the eyes. Biomicroscopic, indirect ophthalmoscopic, and neuro-ophthalmic examinations confirmed that some of these dogs were blind secondary to bilateral retinal dysplasia and detachment (nonattachment) (n = 13), and the remainder had generalized retinal dysplasia (n = 11). Fifteen of these dogs were also diagnosed with unilateral (n = 9) or bilateral (n = 6) persistent hyperplastic primary vitreous. Nutritional, infectious, or toxic etiologies were not evident on physical, postmortem, light microscopic, or transmitting and scanning electron microscopic examination of four affected Miniature Schnauzers. We examined the pedigree and determined that an autosomal recessive mode of inheritance was most likely. Three test-bred litters including those from affected parents, carrier and affected parents, and carrier parents confirmed this mode of inheritance. This study confirms that retinal dysplasia and persistent hyperplastic primary vitreous is a congenital abnormality that is inherited as an autosomal recessive condition in Miniature Schnauzers.

Congenital cataracts and persistent hyaloid vasculature in a llama (Lama glama)

A 9-month-old llama was evaluated for apparent blindness. Bilateral cataracts were diagnosed and cataract surgery was performed on the right eye. At the time of surgery persistent hyperplastic primary vitreous, persistent hyperplastic tunica vasculosa lentis, and a persistent hyaloid artery were observed. Prior to surgery Power Doppler ultrasound revealed a patent tunica vasculosa lentis OS. Despite reports of a poor success rate for llama cataract surgery, through use of careful tissue handling, phacoemulsification, viscoelastic endothelial protectants, anti-inflammatories, and BSS-Plus irrigating solution, vision was successfully restored in both eyes of the llama.