Mass in the Back of the Eye (Choroidal Melanoma) in Dogs
When to visit the vet?
Urgent see a veterinarian within 24 hours
RED flag for acute vision loss, pain, signs of glaucoma (hard eye), blood in the eye, or pronounced inflammatory conditions (uveitis).
Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity
Definition
Can Occur with the Following Diseases:
Basics and possible causes
Choroidal melanomas in dogs are tumors that develop from the melanocytes of the choroid. Melanocytes are cells that produce the pigment melanin, which is responsible for the coloring of skin, hair, and eyes. These tumors are rare in dogs but can cause serious health problems if not treated promptly.
The exact causes for the development of choroidal melanomas are not fully understood. It is believed that a combination of genetic and environmental factors can contribute to the development of such tumors. Some studies suggest that certain dog breeds may have a genetic predisposition to developing eye tumors.
Environmental factors, such as excessive UV radiation, could also play a role, although dogs’ eyes are generally better protected from sunlight than those of humans. Nevertheless, excessive exposure to sunlight could theoretically increase the risk of developing melanomas.
Another possible factor is age. Older dogs seem to be more frequently affected by tumors, suggesting that the risk increases with age. Hormonal changes and a weakened immune response in old age could also contribute to the development of tumors.
Typical accompanying symptoms
- Changes in vision: Dogs with a choroidal melanoma may have Visual disturbances that are noticed by the owner when the dog has difficulty navigating its surroundings.
- Eye protrusion: A tumor in the posterior region of the eye can lead to a visible protrusion of the eyeball, known as exophthalmos.
- Discoloration in the eye: Dark spots or discolorations caused by the tumor may become visible.
- Inflammatory conditions: An inflammation of the eye, leading to redness, Swelling and Pain, can also occur.
- Tear flow: Excessive tear flow can be an indication of a problem in the eye.
- Behavioral changes: The dog may behave differently due to discomfort or pain caused by the tumor, for example, playing less or being more active.
- Eyelids may close unevenly, or the dog may have difficulty opening or closing its eyes.
- In rare cases, headaches may occur, which can manifest as Restlessness or Sensitivity to touch of the head.
When to see a vet?
A visit to the veterinarian is absolutely necessary if you notice any of the above symptoms in your dog. In particular, a change in vision or a visible protrusion of the eye should be taken seriously.
If you notice signs of pain or discomfort, such as increased blinking or rubbing of the eye, the dog should be presented to a veterinarian as soon as possible. Early diagnosis and treatment can be crucial to maintaining the animal’s health and well-being.
If you notice that your dog seems to be blind in one eye or is behaving conspicuously, it is advisable to consult a veterinarian immediately to rule out more serious eye diseases.
Symptom recognition for the pet owner and veterinary diagnostic procedure
The detection of a choroidal melanoma usually involves a combination of clinical examination and imaging procedures. The veterinarian will thoroughly examine your dog’s eye to detect abnormalities. Ophthalmoscopy, which involves examining the ocular fundus, can help identify tumors or other abnormalities.
Additionally, an ultrasound examination of the eye may be necessary to determine the exact location and size of the tumor. In some cases, magnetic resonance imaging (MRI) or computed tomography (CT) may be required to obtain a detailed view of the eye structure.
In some cases, a biopsy may be needed to make a definitive diagnosis. A tissue sample is taken from the tumor and examined microscopically to determine the type of tumor and whether it is benign or malignant.
What the pet owner can do and professional therapy options
As a pet owner, you can take some measures to improve your dog’s well-being until you visit the veterinarian. Avoid applying pressure to the affected area and protect the eye from injury by keeping the dog in a safe environment.
It is advisable to keep the dog in a quiet, dark place to minimize pain and stress. Avoid exposing the dog to unnecessary activities or bright light, as this could lead to additional discomfort.
It is important to follow the veterinarian’s instructions precisely. In some cases, medication may be necessary to relieve inflammatory conditions or pain before further treatment, such as surgery, is considered.
Early diagnosis and initiation of appropriate treatment are crucial to prevent the spread of the tumor and ensure the best possible quality of life for your dog. Do not hesitate to ask your veterinarian for advice and to take all recommended diagnostic and therapeutic measures.