Video S1. Videoendoscopy of the right bronchus of an 18-year-old mare with chronic cough. The mare is intermittently coughing during the procedure. A granular cell tumour was identified obscuring a third generation bronchus. The approximate location of this mass (region of interest) was determined using lateral radiographic projections obtained from the right and left hemithorax and the trachobrnchial map of the lung, reported by Smith et al. (1994). Transendoscopy biopsy was successful in identifying the tumour type in this mare. Because the mass is covered with normal respiratory epithelium, this method is not always successful in obtaining a representative biopsy.

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