Left: A standing CT scan of the rostral nasal passage with a normally sized nasal septum from a horse that did not present for a disorder of the nasal passage. Right: A standing CT scan of the rostral nasal passage at approximately the same location as the picture on the left, in a horse with an abnormal nasal septum. Note the marked thickening and enlargement of the nasal septum and the abnormally thickened alar cartilage (identified with a star). Also note the limited airway available due to the enlargement of structures within the nasal passage. This horse presented for respiratory dyspnea and noise. A diagnosis of fungal (conidiobolomycosis) infiltration of the nasal septum and alar cartilage was made and the horse underwent resection of the nasal septum and affected alar fold and cartilage.
Courtesy of Dr. Lindsey Boone, Auburn University.