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Sudden blindness in a dog (case report)
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A male mixed breed dog of unknown age was presented with sudden onset of blindness and a slightly exophthalmic right eye. Ophthalmoscopically, a spherical, pinkish mass protruding from the region of the optic disc into the vitreous was seen in the right eye. How would you proceed?
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Ultrasound and computer tomography demonstrated an extension of the mass into the right retrobulbar space, continuing intracranially to the optic chiasm. Cytologic findings, obtained by ultrasound-guided fine needle aspiration from the retrobulbar space, were consistent with myxosarcoma. On the basis of these findings of a well-delineated mass in the brain stem area, irradiation was planned as the therapy of choice. The dog was treated under general anesthesia using a proton beam at the Paul Scherrer Institute (PSI, Villigen, Switzerland). A curative protocol (56 Gy in 16 fractions over 4 weeks, 3.5 Gy/fraction) was used. Twenty-seven days post radiation therapy the dog was euthanized, as clinical symptoms progressed. Enlargement of the intracranial tumor was seen on a CT study repeated on the day of euthanasia. A gross pathologic and histologic examination were performed and confirmed the diagnosis of a myxosarcoma involving the eye, retrobulbar space of the right side, and the optic chiasm. Post-mortem examination failed to identify any abnormalities or metastases elsewhere in the body.
Source: Richter, M., Stankeova, S., Hauser, B., Scharf, G., Spiess, B.M. (2003): Myxosarcoma in the eye and brain in a dog. In: Veterinary Ophthalmology 6 (3), pp 183-189.
www.blackwell-synergy.com/links/doi: 10.1046/
j.1463-5224.2003.00289.x
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25th FECAVA EuroCongress 4-9 September 2019, St. Petersburg / RussiaESVN-ECVN Symposium 2018ESAVSVetAgendaLab in Practice - Clinical PathologyEuropean Master of Small Animal Veterinary MedicineSEVC 2014ESAVS - Neuropathology & MRICongressMed 2014ACVIM 2014VetContact
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