Unusual Gross Presentation of Sarcocystis-Like Pectoral Muscle Lymphoma Attributed to Marek’s Disease in a Backyard Chicken

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• 作者：Carlos Daniel Gornatti Churria ; Med Vet^a ; ^{danielgornatti@fcv.unlp.edu.ar} ; ^{danielgornatti@gmail.com} ; Panayiotis Loukopoulos ; DVM ; PG Dip.V St ; PhD^b ; ^c ; Javier Origlia ; Med Vet^a ; Nancy Arias ; Med Vet^a ; Miguel Herrero Loyola ; Med Vet^a ; Miguel Pí ; scopo ; Med Vet^a
• 关键词：backyard chicken ; lymphoma ; Marekʼs disease ; Sarcocystis-like lesions ; pectoral musculature
• 刊名：Journal of Exotic Pet Medicine
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：26
• 期：1
• 页码：3-6
• 全文大小：809 K
• 卷排序：26

文摘

Marekʼs disease–induced lymphomas of skeletal muscle are rarely reported in chickens. Three mixed-breed, adult backyard chickens, which belonged to a flock with a previous history of anorexia, depression, ruffled feathers, whitish diarrhea, weight loss and death, were submitted for postmortem examination and diagnostic testing. Grossly, 2 birds had moderate pectoral atrophy, whereas the remaining chicken had numerous white, rice-grain sized foci distributed throughout the pectoral musculature. Severe proventricular wall thickening was observed in all 3 chickens and moderate intestinal Ascaridia spp. parasitism was diagnosed in 2 of the birds. Microscopically, the peripheral nerves, cerebrum, proventriculus, and pectoral musculature were severely infiltrated by mononuclear pleomorphic cells. Formalin-fixed, paraffin-embedded tissues from all 3 chickens were polymerase chain reaction positive for Marekʼs disease virus. A diagnosis of Marekʼs disease was based on the combined necropsy, histopathology, and polymerase chain reaction findings. This article describes the unusual gross presentation of rice-grain sized and shaped lymphomas in the pectoral musculature of chickens caused by Marekʼs disease.