Peer-reviewed veterinary case report
Periocular sarcoid with bone invasion in a Thoroughbred mare.
- Journal:
- The Canadian veterinary journal = La revue veterinaire canadienne
- Year:
- 2020
- Authors:
- Giraldo, Andres et al.
- Affiliation:
- Department of Clinical Studies (Giraldo · Canada
- Species:
- horse
Plain-English summary
A 12-year-old Thoroughbred mare was found to have a nodular growth on her right upper eyelid. During surgery to remove the growth, the veterinarians discovered that it was firmly attached to the bone underneath. After examining the tissue, they found that the tumor had invaded the bone and was present at the edges of the area they removed. Unfortunately, the tumor came back three months later, and the mare was euthanized a year after the surgery. This case shows that some tumors around the eyes in horses can invade the bone, which can complicate treatment and indicate that these tumors can be aggressive.
Abstract
A periocular nodular sarcoid was diagnosed on the right upper eyelid and medial canthus of a 12-year-old Thoroughbred mare. Enucleation was performed and during the procedure the mass was noted to be firmly adhered to the underlying frontal bone. Partial ostectomy of the dorsal orbital rim was performed. Histopathology revealed invasion of the cortical lamellar bone and the bone marrow by neoplastic spindle cells and extension of these cells to multiple surgical margins. Recurrence at the level of the surgical site and its surroundings occurred 3 months after the procedure. The horse was euthanized 12 months later. Key clinical message: Invasion of the underlying bone occurs in some cases of equine periocular sarcoids. The case highlights how this bone invasion might affect the surgical planning and shows potential aggressiveness of this type of tumor.
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Search related cases →Original publication: https://pubmed.ncbi.nlm.nih.gov/32255829/