Sarcoid within the oral cavity of a horse.
Authors: Munday John S, Lewis Michelle C, Leyland Margaret H
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Oral Sarcoid in an Equine Patient Equine sarcoids, typically cutaneous tumours caused by bovine papillomavirus (BPV) infection, have never been documented in the oral cavity until this case report of a 16-year-old horse presenting with two intraoral masses on the right mandible. Histological examination revealed mesenchymal proliferation with hyperplastic epithelium and thick rete pegs, whilst PCR analysis confirmed the presence of BPV2 DNA, establishing a definitive diagnosis despite the atypical presentation. Following incomplete surgical excision, the patient showed no signs of recurrence at the 5-month follow-up, which differs from the typically aggressive behaviour of cutaneous sarcoids. The authors hypothesise that oral trauma may have provided a route for BPV2 infection of the gingival tissues and that certain BPV types may have distinct tropism for mucosal surfaces, warranting further investigation. Whilst exceptionally rare, oral sarcoids should be included in the differential diagnosis for intraoral masses in horses, particularly when histology and molecular testing are available to distinguish them from more common neoplasias and reactive lesions in the mouth.
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Practical Takeaways
- •Include sarcoid in the differential diagnosis for oral masses in horses, despite its rarity in this location
- •Consider oral trauma history when evaluating horses with intraoral masses, as it may predispose to sarcoid development
- •Incomplete excision of an oral sarcoid may not necessarily result in recurrence, though longer-term follow-up data are needed
Key Findings
- •First documented case of equine sarcoid occurring in the oral cavity of a horse, presenting as mandibular and labial commissure masses
- •BPV2 DNA was detected in the oral sarcoid mass, consistent with bovine papillomavirus etiology
- •Incomplete surgical excision did not result in recurrence after 5 months of follow-up
- •Oral trauma may be a risk factor for sarcoid development in the mouth, and different BPV types may have variable ability to infect gingival tissue