Clinical and Pathological Features in Horses With Advanced Arytenoid Chondritis.

The research examined characteristics of horses with advanced arytenoid chondritis, a disease causing airway obstruction due to abnormal growths, with the goal of informing surgical treatment decisions. The study compared clinical scores and ultrasonographic findings with observable and microscopic lesions and proposed a new surgery method based on the findings.

Methods and Participants

• The study involved 17 horses naturally affected by severe or advanced arytenoid chondritis and 4 control arytenoid cartilages evaluated after partial arytenoidectomy.
• The cartilages were dissected and measured, with the researchers assessing total gross area (TA), percentage of viable cartilage (VC), percentage of viable cartilage on the lateral wall, and medial expansion.

Retrospective Examination

• The researchers retrospectively used the gross lesions to suggest two preferred surgical management groups: those requiring partial arytenoidectomy and those amendable to a more conservative approach called focal medial resection.

Findings

• The TA of horses with arytenoid chondritis was significantly larger than the controls, revealing a layered lesion composed of cavitation, granulation tissue, fibrosis, inflammation, hemorrhage, and edema.
• The increased TA was comparable to the presence of immature cartilage with disorganized primitive mesenchymal cells.
• Statistically, TA and surgical management methods were positively correlated. All the cases showed varying severity of cartilage degeneration or necrosis, more severe medially.
• Those appearing suitable for the focal medial resection had significantly more viable cartilage on the lateral wall.

New Surgical Approach

• The gross and microscopic findings suggest a new surgical approach, focal medial resection, which could potentially preserve the lateral wall of the arytenoid, thereby presenting a potentially less invasive treatment solution for horses affected by arytenoid chondritis.