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Online Journal of Veterinary Research

Volume 23 (2):112-120, 2019.

Types and histopathological characteristics of equine sarcoid.


Mohammad Hamid Kareem, Sufian Saleh Salman.


Dept. of Internal & Preventive Medicine, College of Veterinary Medicine, University of Baghdad, Iraq.




Kareem MH, Salman SS., Types and histopathological characteristics of equine sarcoid, Onl J Vet Res., 23 (2):112-120, 2019. We report types and histopathology of equine sarcoid found in Baghdad Province, Iraq. One hundred skin samples from horses of different sex and age were excised and fixed in 10% formalin to confirm diagnosis and histopathology. Equine sarcoids were identified as ocular, malevolent, fibroblast, nodular or mixed types. Our findings revealed that joint, leg, and ocular regions were most affected. Sarcoid types were fibroblastic in 67%, varrucous 13%, occult or flat 5%, mixed 4% and malevolent in 1%. Microscopy revealed sarcoid tissue characterized by cells with fibroblastic proliferation and overlying acanthosis, hyperkeratosis and parakeratosis. Pathognomic fingerlike hyperplastic projections of the stratum basale with fibro-vascular core were evident. We observed proliferation and hydropic degeneration of granulocytes in the stratum granulosum. Tumor cells infiltrated the border of normal tissue expanding the dermis and causing surrounding moderate epithelial hyperplasia. Slides showed fibroblastosis, deposition of collagen, lymphocytosis and koilocytes with swollen clear cytoplasm and perinuclear keratinocytes with pyknotic nuclei.


Keywords: Equine sarcoids, Prevalence, epidemiology, histopathology, type.