Idiopathic Unilateral Masseter Muscle Hypertrophy: a Case Report and Review

Masseter muscle hypertrophy also called as Benign Massetric hypertrophy (BMH) or Idiopathic Massetric Muscle Hypertrophy (IMMH) is a rare condition of unknown cause which is important in the differential diagnosis of head and neck masses, located in the cheek. It can occur unilaterally or bilaterally. Most patients consult a physician for esthetic correction of the resultant facial asymmetry. Symptoms such as trismus, protrusion, and bruxism may also occur. Associated pain may be present very rarely. Several treatment options are reported for masseter hypertrophy, which range from simple pharmacotherapy to more invasive surgical reduction. The purpose of this article is to report a case of masseter hypertrophy in a 30 year old female, which was surgically treated by debulking of masseter muscle and mandible ramal osteotomy.