Ectopic pleomorphic adenoma in intramuscular plane of sternocleidomastoid muscle: A rare case report

Abstract

Pleomorphic adenoma is the most common salivary parotid gland tumor. It is a benign tumor, represents 45% of parotid gland tumors, and 6.5% are found in the minor salivary glands. Only five cases of ectopic mixed salivary gland tumors in the upper neck in adult patients have been reported. The present case had an ectopic pleomorphic adenoma in intramuscular plane of sternocleidomastoid muscle. Ultrasound and fine-needle aspiration biopsy revealed swelling to be pleomorphic adenoma. Intraoperatively, the swelling was not arising from the parotid gland. Although pleomorphic adenoma arising from heterotropic salivary gland tissue is rare. Pleomorphic adenoma is the most common type of salivary gland tumor. Salivary gland tumor rarely occurs in ectopic sites. Good clinical acumen along with proper diagnostic techniques is required in the diagnosis of such cases.