The use of hyaluronic acid subdermal filler for entropion in canines and felines: 40 cases

Purpose To evaluate the use of hyaluronic acid (HA) subdermal filler in canines and felines for entropion. Methods Complete ophthalmologic examination was performed by a board‐certified veterinary ophthalmologist or ABVO‐approved resident. Each case was characterized as primary, secondary, spastic or cicatricial entropion. HA subdermal filler, specifically Restylane® and Restylane Silk®, were utilized in dogs and cats, respectively. Subdermal injection was performed 1‐2 mm from the eyelid margin in the affected area until normal eyelid conformation was achieved. All patients did not require sedation or general anesthesia. Results Forty animals (28 dogs and 12 cats) were included in the study. No local reaction to the HA dermal filler or any other complications other than minor skin bleeding at the injection sites were noted in all patients. Resolution of entropion and secondary complications including corneal ulceration, epiphora, and blepharospasm were noted by the first week after injection in the majority of cases. Three canines and one feline case failed to resolve the entropion, necessitating additional permanent surgical intervention. Two cases were submitted for histopathological analysis. Median follow‐up time for all cases was 152.5 days (mean: 194.6 ± 142.7 days; range 9‐419 days). Five patients died or were euthanized during the study for unrelated causes. Conclusions Hyaluronic acid (HA) subdermal filler appears to be a safe, easy, reliable method for mild to moderate eyelid entropion not requiring general anesthesia. This procedure may be especially appropriate for geriatric patients and those with high anesthetic risk with entropion.