Lymphangioma in the Horse

Johanna L. Watson • Monica Aleman

Lymphangioma is a rare tumor in horses that originates from lymphatic vessels. Morphologically, lymphangiomas are classified into three types: simplex or capillary, cavernous, and cystic.³⁸ This tumor may involve cutaneous tissues of the mammary gland, thigh and inguinal regions, pleural cavity, and intestines and has only been observed in young horses.^39-41 Clinical signs vary depending on tumor location. At diagnosis, these tumors were extensive; surgical removal was not attempted, and all horses were reportedly euthanized.

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