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J Comp Pathol. 2010 Jul;143(1):57-60. doi: 10.1016/j.jcpa.2009.11.005. Epub 2009 Dec 29.

Identification of equine cutaneous lymphangioma by application of a lymphatic endothelial cell marker.

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  • 1Department of Pathology, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany.


An adult horse was presented with a mass located within the dermis and subcutis of the right forelimb. At post-mortem examination there was a marked increase in thickness of the subcutis of the right forelimb extending from the fetlock to the pectoral muscles. Microscopically, the dermis and subcutis were diffusely infiltrated by endothelial-like cells forming irregular channels and cavernous spaces. Immunohistochemical examination revealed the endothelial-like cells to express vimentin, factor VIII-related antigen and PROX-1, confirming the identity of the tumour as a lymphangioma. Ultrastructural analysis showed that the cavernous spaces were lined by a discontinuous endothelium lacking any basement membrane.

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