Imaging diagnosis–nasofrontal suture exostosis in a horse.

The research discusses a case where a 14-year-old Quarter Horse with chronic facial swelling and recent bilateral epiphora symptoms showed signs of nasofrontal suture exostosis, which was confirmed through computed tomography (CT) scans. The CT scans facilitated presurgical planning, allowing for successful removal of the exostosis and subsequent resolution of the clinical signs.

Identification and Diagnosis

• The study revolves around a 14-year-old Quarter Horse which had been suffering from chronic facial swelling and a more recent condition of progressive bilateral epiphora – a condition where there is an overflow of tears due to a blockage or interruption of normal tear drainage.
• Radiographic evaluation led to initial findings hinting at exostosis of the nasofrontal suture. Exostosis refers to the formation of new bone on the surface of a bone, caused by inflammation or trauma. In this case, the new bone growth was detected at the nasofrontal suture, the junction between the nasal and frontal bones.

Use of Computed Tomography (CT)

• To confirm the diagnosis and provide further insight into the issue, computed tomography (CT) scans of the horse’s head were performed. This included CT dacryorhinocystography, a specific type of CT scan that provides detailed images of the tear drainage system.
• The CT scans not only confirmed the diagnosis but also allowed for detailed presurgical planning, crucial for successful treatment.

Resection of the Exostosis

• Based on the confirmation and the detailed view facilitated by CT scans, a presurgical plan was developed for the removal, or resection, of the nasofrontal exostosis.
• The implementation of this plan led to the successful removal of the exostosis.

Post-surgery Results

• After the surgical removal of the exostosis, the clinical signs – including the facial swelling and bilateral epiphora – were resolved, indicating successful treatment.