16 Year Old, Warmblood Gelding
This patient had a one month history of head shaking, left periorbital edema and mild exophthalmus (protrusion of the eyeball). There was no history of trauma and radiographs showed no significant abnormalities. An MRI of the left orbit and brain was performed.
These images show a moderate to large sized, somewhat aggressive soft tissue mass deep in the retrobulbar (behind the eye) space.
The mass measures approximately 5.5 x 2.2 x 5.6 cm and is predominantly deeply located in the ventral and medial aspect of the retrobulbar space. The tumor is causing lyses of the orbital part of the frontal bone (lateral wall of the left ethmoid turbinates). This ethmoid invasion is within approximately 7mm of the lateral ventricle olfactory recess.
This lesion is most suspicious of representing an unusual neoplasia (such as a melanoma, lipid rich adenocarcinoma…) or a cholesterol containing neoplasia or possibly granuloma.
A biopsy and radiation treatment was recommended as a treatment option.
As of June 2012, the owner decided not to pursue the biopsy and radiation treatment. There has been little change since the time of the MRI, and he is being ridden.
This case will be updated as information becomes available.