This is a sinus infection that is usually secondary to a tooth root abscess or dental disease. Clinical signs include mucoid nasal discharge (whitish or yellowish color) from one or both nostrils, decrease appetite, weight loss, dropping of feed of hay when the horse is eating, and/or your horse may have a foul odor to their breath.
Radiographs of skull, CT of horse’s head (gives best diagnostic detail),video endoscopy, oral exam/dental exam
Horse’s with secondary sinusitis need to have the infected tooth removed. This can be done under sedation through oral extraction. This is the best option and results in the least number of post-operative complications. If a tooth cannot be removed through oral extraction, the horse will need to be placed under general anesthesia and the tooth is repulsed with dental punches. Following extraction of the infected tooth the horse will need to be on systemic antibiotics for an extended period of time following surgery.