Aryepiglottic lymphoma in a 19‐year‐old Paint gelding treated with excision and adjunctive radiotherapy

Summary This case report describes the diagnosis and treatment of an aryepiglottic tumour in a 19‐year‐old Paint gelding. Diagnostic work‐up included physical examination, endoscopic evaluation of the upper airway, and histopathology of the mass following removal. Treatment consisted of surgical excision of the aryepiglottic mass under endoscopic guidance followed by a 100 Gy dose of radiation delivered with strontium‐90 plesiotherapy to the surgical bed at 72 h post‐operatively. The radiation applicator was passed through the left nostril and the application area was confirmed via endoscopic evaluation. Histopathology, including immunohistochemistry, confirmed that the aryepiglottic tumour was T cell lymphoma. Recheck examination, including physical examination and upper airway endoscopy, was performed 1, 3 and 6 months following treatment and local recurrence was not observed. Local control with minimal morbidity can be achieved with surgical excision of equine lymphoma followed by strontium‐90 plesiotherapy.