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Meibomian Epithelioma of the Lower Eyelid in a Thoroughbred Horse
Seong-Kyoon Choi1§, Jin-Kyu Park1§, Won Bae Jeon, Kyung-Hyun Lee2 and Gil-Jae Cho*
College of Veterinary Medicine and Institute of Equine Medicine, Kyungpook National University, Daegu city 702-701, Republic of Korea; 1Laboratory of Biochemistry and Cellular Engineering, Division of NanoBio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873, Republic of Korea; 2Animal, Plant and Fisheries Quarantine and Inspection Agency, Ministry for Food, Agriculture, Forestry and Fisheries, Anyang, Republic of Korea. *Corresponding Author:


A 9-year old, castrated male, thoroughbred horse presented for a left lower eyelid mass with ocular signs of mucopurulent discharge, conjunctival hyperemia and ocular discomfort. On physical examination, there was no other abnormality. Surgically, the mass arising from the inner surface of left lower eyelid was excised and examined histopathologically. Microscopically, the eyelid mass exhibited neoplastic basaloid cells forming irregular cell masses of variable size separated by thin fibrous tissues. The basaloid cells showed mildly pleomorphic and undifferentiated appearances with prominent oval nuclei and scant cytoplasm. Poorly differentiated meibocytes were observed occasionally in the periphery regions of the cell masses suggesting the mass of lower eyelid originated from meibomian glands. Based on histopathological observation, the present case was diagnosed as an equine meibomian epithelioma in the lower eyelid. To the author’s knowledge, the present case is the first report of equine meibomian epithelioma in veterinary literatures.

Key words: Horse, Lower eyelid, Meibomian epithelioma, Meibomian gland tumor, Modified sebaceous gland


ISSN 0253-8318 (Print)
ISSN 2074-7764 (Online)