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Acute blindness due to suspected ivermectin toxicosis in a foal
A lot of potential clinical signs can be expected in ivermectin toxicosis, varying from ataxia, depression, salivation to coma or even death in severe cases. This case is interesting but unusual: acute blindness in a very young foal. The good news: It recovered completely...

A 9-week-old miniature mule foal presented to the Veterinary Medical Teaching Hospital for acute blindness, ataxia, and depression following an overdose of an over-the-counter ivermectin-based de-worming medication.

Ophthalmic examination and electrodiagnostic evaluation eliminated outer retinal abnormalities as the primary cause of the bilateral blindness, implicating instead a central neurologic effect of the drug.

With symptomatic and supportive care, the foal recovered fully and regained its vision.



Source: Plummer, Caryn E., Kallberg, Maria E., Ollivier, Franck J., Brooks, Dennis E. & Gelatt, Kirk N. (2006): Suspected ivermectin toxicosis in a miniature mule foal causing blindness. In: Veterinary Ophthalmology 9 (1), 29-32.




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EQUINE

CT diagnosis of fatigue fracture of Mt 3 in young adult horsesmembers
Two young adult endurance horses were presented for investigation of sudden-onset forelimb lameness during competition. Clinical examination revealed a severe forelimb lameness and pain on palpation of the proximal palmar metacarpal area. Initial radiographic survey of the affected forelimb was unremarkable in both cases. A week of box rest resulted in only a mild improvement in the lameness. A second radiographic examination did not reveal any significant abnormalities. The history is very suspicious for a fracture, especially a fatigue fracture. How was it diagnosed and treated finally?

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