Enucleation in Cattle

Enucleation is a surgical procedure to remove the eye. This procedure is most commonly used for severe ocular trauma, chronic ocular disease, or ocular tumors (neoplasia), where the best course of action is to remove the eye to provide pain relief. The procedure is generally well tolerated, and cattle can continue to live in comfort following healing of the surgical incision. 

Indications for enucleation include 

1. Severe Ocular Trauma: this can include penetrating wounds to the eye or rupture of the globe 
2. Intractable Ocular Disease: including chronic uveitis, severe corneal ulceration, or glaucoma. Enucleation may be performed to improve comfort in these cases. 
3. Intraocular neoplasia: Squamous cell carcinoma is the most common ocular tumor in cattle, with lymphoma being second most common. Enucleation may be used for tumors in locations or of a size where excision isn’t possible or likely to be incomplete to improve animal comfort and reduce the chance of disease progression. 

Prior to determining if enucleation is appropriate for your animal, your veterinarian will perform an eye exam, which may require a darkened space, appropriate restraint and potentially sedation. The exam may include fluorescein stain to assess corneal ulcers, and/or tonometry measurement of ocular pressure in cases of suspected glaucoma. With ocular tumors, a tissue biopsy may be taken to determine the type of tumor, and lymph nodes should be palpated to check for enlargement. 

Enucleation is most often performed as a standing procedure with local anesthesia (nerve blocks), however certain pathologic or patient features may necessitate general anesthesia. Several techniques are described, and the specific procedure may depend on the surgeon’s preference and pathology involved. For every procedure, the globe and the third eyelid are removed, with other ocular tissues depending on the pathology present, and the eyelids are sutured closed unless there is indication to allow the incision to heal on its own.  

While rare, potential surgical complications may include hemorrhage, damage to surrounding structures (such as the optic nerve or orbital vessels), inadequate closure of the eyelids, infection, or post-operative swelling and discomfort. Experienced veterinary surgeons, peri-operative monitoring, and attentive post-operative care are essential for minimizing the risk of adverse events and ensuring the safety and success of the procedure. 

Postoperative management may involve pain management, antibiotics, and incision care. Regular follow-up examinations with your veterinarian are essential to monitor healing progress, assess ocular comfort, and address any concerns or complications that may arise during the recovery period. Most cattle transition well to losing an eye, particularly if they were vision impaired prior to the procedure. If they were still visual, it may take some time for them to adjust and may experience spookiness, anxiety, or altered spatial perception for a period. For enucleations performed for ocular trauma or chronic inflammation, the prognosis is quite good. For those requiring enucleation due to neoplasia, the prognosis will depend on the extent of disease at the time of surgery, and metastasis or recurrence is possible if the disease was advanced when enucleation was performed.