Diseases of the Paranasal Sinuses in Horses. The maxillary sinus is the largest paranasal sinus and is divided by a thin septum into caudal and rostral parts. The frontal sinus has a large communication with the dorsal conchal sinus at its rostral end, thereby forming the conchofrontal sinus.Equine Sinus Cysts. Swellings on the side of the face with no nasal discharge are usually caused by tooth root abscesses of the first 2 molar teeth. The first 2 molars are in front of the sinuses and therefore if infected will cause swelling of the bone rather than draining into the sinus and then down the nose. maxillary sinus cyst horse
Horses have complex, air filled paranasal sinus cavities with seven paired paranasal sinuses. In younger horses, the maxillary sinus accommodates the reserve crowns of the last four cheek teeth and as the horse ages, so the sinus becomes progressively larger. Five of these sinus cavities drain through a communal opening into the nasal cavity.
The volume of the sinus continues to increase from birth through the life of the horse as the teeth continue to erupt and migrate forward. The maxillary sinus is more predisposed to disease than the other sinuses because of direct communication with the nasal cavity and its Jun 11, 2013 Paranasal Sinus Cyst in a Horse Figure 1A: Figure 1B: At surgery, a large paranasal cyst was exposed in the left maxillary sinus and a small cyst was identified in the right maxillary sinus. Both cysts were removed and the gelding recovered uneventfully. It is likely that the cysts began to develop early in life for this gelding and did notmaxillary sinus cyst horse Feb 20, 2018 Thanks for watching! There are six pairs of paranasal sinuses on each side of the horses head. The two frontal sinuses are closest to the surface of the forehead. The two maxillary sinuses are the largest sinuses and divided by a thin wall
The clinical signs that the horse was experiencing were typical of horses with a maxillary sinus cystwith the most common being nasal airway obstruction, facial swelling, and nasal discharge. Affected horses often make respiratory noises when exercising, as a result of the narrowing of the nasal passage, due to the cyst growth. maxillary sinus cyst horse