Slow, painless exophthalmos in the older dog: orbital neoplasia
10-year-old Golden Retriever with left exophthalmos that has slowly increased over 2 months, with globe deviation and reduced retropulsion. There is no fever or pain on opening the mouth, and vision is preserved.
Which statement is correct?
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A. A retrobulbar abscess is most likely, so drainage behind the last molar is indicated
The slow course and the absence of fever and pain on opening the mouth make an abscess very unlikely; draining without a diagnosis would delay treatment.
B. It suggests orbital neoplasia, which in dogs is malignant in most cases; CT or MRI and cytology or biopsy are indicated
Correct. CT or MRI shows the extent, bone lysis and invasion of the sinuses or nasal cavity, and allows guided sampling. Canine orbital tumours are usually primary and malignant.
C. Most canine orbital tumours are benign and encapsulated, so they can simply be removed without staging
It is the other way round: most are malignant and locally invasive, so advanced imaging and staging are essential before surgery.
D. Start a therapeutic trial of corticosteroids: if it improves, a tumour is ruled out
Some tumours, such as lymphoma, and peritumoural inflammation respond temporarily to corticosteroids, so improvement does not rule out neoplasia and may mask the diagnosis.
lightbulb Key takeaway
Acute, painful exophthalmos: think abscess or cellulitis; slow and painless in an older animal: think tumour. Also check the nasal cavity, because nasal tumours often invade the orbit. Protect the cornea if the eyelids do not close properly.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.