Cenurosis in a Sheep with Neurological Signs - Diagnosis with Computed Tomography
Background: Cenurosis is a parasitic disease caused by Coenurus cerebralis, an intermediate form of Taenia multiceps multiceps, causing a fatal disease in production animals. Its adult form (Taenia) lodges in the small intestine of canids and can infect several intermediate hosts.Sheep are the main species affected by the disease, having nervous symptoms as one of its manifestations.This study aimed to describe the changes observed in computed tomography, as well as the clinical findings of a case of Cenurosis in a sheep on the western border of Rio Grande do Sul.
Case: A ram was referred to the Centro Universitário da Região da Campanha (URCAMP) with neurological signs.Clinical, hematological, radiographic, tomographic and necroscopic evaluation of the animal was performed.There were no significant hematological and radiographic changes.During the neurological examination, corneal opacity was found in the right eyeball, associated with a visual deficit in the same eye.Also, when stimulated to move, it was possible to observe ataxia with ambulation to the left side, with right lateral displacement of the head.The tomography showed a hypodense area of approximately 3 cm at the base of the brain, in the region of the thalamus and third ventricle.Macroscopically, a translucent spherical cyst with approximately 4 cm in diameter was observed, containing the protoescolex/scolices of Taenia multiceps in the same region.
Discussion: Computed tomography identified the presence of an apparently circular volume of approximately 4 cm in diameter, causing ventricular dilatation.This evidence of ventricular dilation corroborates aspects described in the literature, which found bilateral dilation of the ventricles by compression promoted by a cyst in the 4th ventricle.As the location of the cyst was located at the base of the brain, in the region of the third ventricle, it would be difficult to perform the surgery in the treatment of this case.Signs of ataxia, walking movements, decreased reflexes, nystagmus, unilateral blindness and lateral decubitus are commonly observed.Reports described that the main neurological alterations observed in 20 sheep with cenurosis were postural deficit, locomotion alteration, visual deficit and behavioral alterations, with more than 50% of the animals showing at least one of these signs.The main neurological signs observed in the case described were changes in gait, with walking, blindness, lateral head deviation and ataxia. These signs guide the clinical diagnosis of cenurosis.At necropsy, a spherical translucent cyst with approximately 4 cm in diameter was observed, containing the protoescolex/scolices of Taenia multiceps, which extended dorsally from the third ventricle to the base of the thalamus, laterally displaced to the right side.Rostrocaudal the lesion extended rostrally across the entire length of the thalamus to the beginning of the caudate nucleus and caudally to the base of the caudal colliculus, causing compression of the adjacent parenchyma, enabling the diagnosis of cenurosis.Similar findings are described as Coenurus cerebralis. This lesion pattern macroscopically characterizes the parasite lesions.Thus, it is concluded that the visualization of a hypodense area in CNS regions of sheep with neurological signs allows the diagnosis of cenurosis and precise location of the lesion.The description of this case adds information so that other professionals in the field can be successful in diagnosing the disease.
Keywords: parasitologia, Taenia multiceps multiceps, Coenurus cerebralis, ovelhas, torneio verdadeiro.
Descritores: parasitology, Taenia multiceps multiceps, Coenurus cerebralis, sheep, true tournament.
Título: Cenurose em ovino com sinais neurológicos - diagnóstico com tomografia computadorizada.
Abera S., Wubit T. & Abdela N. 2016. Cerebral coenurosis in small ruminants: A review. Journal of Animal Science Advances. 6(3): 1595-1608.
Athar H., Mir A.Q., Gugjoo M.B., Ahmad R.A. & Khan H.M. 2018. Ultrasonography: An affordable diagnostic tool for precisely locating Coenurosis cyst in sheep and goats. Small Ruminant Research. 169: 19-23.
Evangelisti M.A., Varcasia A., Deiana R., Zobba R., Passino E.S., Scala A. & Manunta M.L. 2016. Clinical evolution of cerebral coenurosis from invasive to chronic infection in sheep and a goat. The Journal of Infection in Developing Countries. 10(10): 1151-1155.
Gonzalo-Orden J.M., Altónaga J.R., Díez A., Gonzalo J.M. & Orden M.A. 2000. Correlation between MRI, computed tomographic findings and clinical signs in a case of ovine coenurosis. The Veterinary Record. 146: 352-353.
Gonzalo‐Orden J.M., Díez A., Altónaga J.R., Gonzalo J.M. & Orden M.A. 1999. Computed tomographic findings in ovine coenurosis. Veterinary Radiology & Ultrasound. 40(5): 441-444.
Gazioglu A., Simsek S., Kizil O., Ceribasi A.O., Kesik H.K. & Ahmed H. 2017. Clinical, pathological and molecular evaluations and CT scan screening of coenurosis (Coenurus cerebralis) in sheep and calves. Revista Brasileira de Parasitologia Veterinária. 26(1): 3-9.
Kish G.F., Khodakaram-Tafti A., Hajimohammadi A. & Ahmadi N. 2015. Clinical and morphopathological characteristics of an enzootic occurrence of acute coenurosis (Coenurus cerebralis) in a sheep herd. Journal of Parasitic Diseases. 39(2): 280-283.
Morandi B., Mazzone A., Gori F., Alvarez Rojas C.A., Galuppi R., Deplazes P. & Poglayen G. 2020. New insights into the peculiar world of the shepherd-dog parasites: an overview from Maremma (Tuscany, Italy). Frontiers in Veterinary Science. 7: 670.
Rissi D.R., Rech R.R., Pierezan F., Gabriel A.L., Trost M.E. & Barros C.S.L.D. 2008. Cenurose em ovinos no sul do Brasil: 16 casos. Ciência Rural. 38(4): 1044-1049.
Tena L., De Miguel R., Castells E., Escudero A. & Lacasta D. 2020. Chronic coenurosis in sheep: spontaneous remission of clinical signs and role of CT and MRI in the diagnosis and follow-up. Veterinary Record Case Reports. 8(2): e001092.
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