PARANASAL SINUS OSTEOMA IN AN AMERICAN MINIATURE HORSE - COMPUTED TOMOGRAPHIC EVALUATION AND SURGICAL-MANAGEMENT

A 3-year-old American Miniature Horse stallion was presented with a su spected mass in the right nasal region. The horse experienced nasal di scharge from the right nostril and difficulty breathing. Computed tomo graphy revealed a subcutaneous soft tissue swelling visible on the rig ht side of the face. A 3 x 4 cm paranasal sinus osteoma located dorsal and medial to the first molar was surgically removed. The most common location of osteomas in horses is paranasal sinuses. The American Min iature Horse presented in this case is consistent with observations ma de by others, that sinus osteomas in horses occur almost exclusively i n young male horses. The reason for this tendency is unknown.