Clinical characteristics and histopathologic features of movable inflammatory laryngeal masses in five dogs.

Information on inflammatory laryngeal masses in dogs remains extremely limited. We aimed to describe the clinical and histopathological features and outcomes of five dogs with bilateral, movable inflammatory laryngeal masses. Stridor was a common clinical sign, followed by dysphonia and snoring, all of which were mild. The presence of movable masses was confirmed in all dogs through fluoroscopic or echolaryngographic evaluation. Laryngeal endoscopy identified two masses in each dog, consistent with everted laryngeal saccules. Surgical excision was performed in all dogs, and no recurrence was observed during a median follow-up of 13 months. Histopathological analysis revealed chronic laryngitis characterized by fibrosis, lymphoplasmacytic infiltration, edema, and lymphangiectasia, consistent with findings reported in laryngeal saccules associated with brachycephalic airway syndrome in dogs.