Case History

• 9-month-old Percheron gelding presented for respiratory noise of 3 months duration

• Physical examination of horse was normal and no obvious facial asymmetry.

• Respiratory tract examination

• No nasal flow left nostril

• Mild mucoid discharge from right nostril

• No respiratory distress

• Endoscopy of upper respiratory tract

• Left nasal passage collapsed and only could get in approx. 5 cm from nose

• Right nasal passage could pass to larynx.

• Arytenoids normal abduction, no abnormalities

• Trachea normal with mild amount of mucoid discharge

• Referred for CT to see extend of mass in head and what origin is.

Final Diagnosis

• Horse was euthanized due to extent of mass as well as poor prognosis an autopsy was performed

• Final diagnosis on autopsy was Multilocular aneurysmal bone cyst