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Nasal septal thickening, horse

Courtesy of Dr. Bonnie R. Rush.

Dorsoventral radiographic projection of the nasal passage of a mare with nasal septal thickening. The margins of the rostral aspect of nasal septum are obscured by the dental arcade; in normal horses, the margins of the septum are visible axial to the dental arcades. The abnormal margins of the caudal septum can be identified overlying the nasopharyngeal region.