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Intravascular papillary endothelial hyperplasia of the conjunctiva in a horse
Héctor Daniel Herrera1, Adriana Graciela Duchene, J Oscar Croxatto
1School of Veterinary Sciences, University of Buenos Aires, Chorroarín 280(1427), Buenos Aires, Argentina. hdh@fvet.uba.ar
Objective:
Vascular tumors of the conjunctiva in the horse are rare. We present a unique case of an intravascular papillary endothelial hyperplasia of the conjunctiva.
Animal Studied:
Horse.
Procedures:
Case report. A 6-year-old-mare presented with a red mass in the conjunctiva of the left eye. After complete ophthalmologic examination the lesion was excised. The tissue was processed for light microscopy and studied histopathologically.
Results:
Pathologic examination revealed a nonencapsulated vascular lesion composed of confluent vascular spaces filled by multiple papillary structures composed of a central collagenous core lined by hyperplastic endothelial cells. There was neither atypical endothelial cell nor mitotic activity.
Conclusions:
Intravascular papillary endothelial hyperplasia is a benign proliferative lesion that should be differentiated from malignant vascular tumors.
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