Mast cell tumors (cutaneous mastocytoma, cutaneous mastocytosis) are c
onsidered rare, uncommon, or infrequent in horses. They most commonly
appear as solitary nodules on the head, trunk, neck and limbs.1-3,5,9-
13 This article describes the surgical management of an unusual equine
mast cell tumor with previously unreported sequelae. A review of curr
ent information regarding mast cell tumors in the horse follows the ca
se report.