Advanced imaging consisting of computed tomography (CT) and magnetic resonance imaging (MRI) confirmed a large mass in the base of the skull invading the sinuses and asymmetrically compressing the optic nerves rostral to the optic chiasm.
Due to the size and location of the mass as well as severity of associated neurological signs, humane euthanasia was elected.
Necropsy examination identified a large mass effacing the sphenopalatine sinuses and compressing the optic nerves.
Histologically, the mass was identified as an ossifying fibroma (OF) and degeneration of the optic nerves was confirmed.
As an OF in this location has never been described in a horse, this case demonstrates a new differential for blindness in horses.
Source: R. G. Madrigal M. C. Friedemann J. M. Vallone C. M. Ruoff L. V. Vallone T. Laughrey R. R. Rech M. C. Coleman, Ossifying fibroma as a cause of blindness in a 5â€yearâ€old Quarter Horse gelding. EVE, Early View. First published: 28 May 2018 https://doi.org/10.1111/eve.12944
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