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Progressive Ethmoid Hematomas in Horses

Slowly, progressive, expansive, non-neoplastic masses, submucosal growing in the ethmoidal labyrinth, the conchae or in a sinus. The mass has the aspect of a hematoma. The horses show an unilateral epistaxis.

Ethmoid hematoma (endoscopic image). Courtesy of Dr. Sameeh M. Abutarbush

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An unilateral epistaxis due by a slowly growing, non-neoplastic masses, with the aspect of a hematoma in the ethmoidal labyrinth. Progressive Ethmoid Hematomas are masses of blood and fibrous tissue encapsulated in normal respiratory epithelium originating from the submucosa of the ethmoid labyrinth. The cause is unknown but might be associated with repeated episodes of submucosal hemorrhage. Major signs are unilateral epistaxis or nasal discharge. Can lead to asphyxia over a 1-7 year course. On endoscopy there is a reddish- or yellowish-green encapsulated mass in the ethmoid region. The lesion can recur or develop in the contralateral ethmoid meatus.
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