Merck Manual

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Nasal septal thickening, horse
Nasal septal thickening, horse

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.

Courtesy of Dr. Bonnie R. Rush.