## Overview Parotid gland melanoma is a melanocytic tumor in the region of the parotid salivary gland, common in older gray horses. It appears as a firm nodular mass. Large tumors can affect the facial nerve (causing lip droop) or interfere with swallowing. Biopsy shows dark pigmented tissue. ## Causes Genetic predisposition of gray horses to melanoma. ## Diagnosis Physical examination and biopsy. Staging for internal spread if the mass is large. ## Treatment Surgical excision when feasible, local chemotherapy, or monitoring. Systemic options are limited. ## Recovery and Prognosis Good for local control of accessible masses. The overall melanoma tendency in gray horses is progressive. ## Prevention None. Regular monitoring of gray horses.
firm nodular mass near the parotid; possible lip droop from facial nerve involvement; dysphagia if large; dark cut surface
## Overview Parotid gland melanoma is a melanocytic tumor in the region of the parotid salivary gland, common in older gray horses. It appears as a firm nodular mass. Large tumors can affect the facial nerve (causing lip droop) or interfere with swallowing. Biopsy shows dark pigmented tissue. ## Causes Genetic predisposition of gray horses to melanoma. ## Diagnosis Physical examination and biopsy. Staging for internal spread if the mass is large. ## Treatment Surgical excision when feasible, local chemotherapy, or monitoring. Systemic options are limited. ## Recovery and Prognosis Good for local control of accessible masses. The overall melanoma tendency in gray horses is progressive. ## Prevention None. Regular monitoring of gray horses.
firm nodular mass near the parotid; possible lip droop from facial nerve involvement; dysphagia if large; dark cut surface