Abstract
Masseter muscle hypertrophy is a rare condition of idiopathic cause. It clinically presents as an enlargement of one or both masseter muscles. Most patients complain of facial asymmetry; however, symptoms such as trismus, protrusion, and bruxism may also occur. Several treatment options reported for masseter hypertrophy are present, which range from simple pharmacotherapy to more invasive surgical reduction. Keloid scar with unilateral masseter hypertrophy is a rarely seen in clinical practice. This paper reports a case of unilateral masseter hypertrophy with keloid scar in the angle of the mandible for which surgical treatment was rendered to the patient by using a single approach.
Highlights
Masseter hypertrophy is usually an asymptomatic enlargement of one or both masseter muscles
Data from clinical and radiographic examination led to the diagnosis of unilateral masseter muscle hypertrophy (Figures 1, 2, 3, 4, 5, and 6)
Diagnosis of masseter hypertrophy can be achieved from clinical examination, history, panoramic X-ray, and muscle palpation
Summary
Masseter hypertrophy is usually an asymptomatic enlargement of one or both masseter muscles. A congenital variety exists, but acquired masseter hypertrophy is more common. Unilateral occurrence can be seen when patients chew or clench primarily on one side. Muscle function may be impaired, causing conditions such as trismus, protrusion, and bruxism. Numerous factors such as malocclusion, bruxism, clenching, or temporomandibular joint disorders, have been cited. The accurate diagnosis is more difficult in unilateral cases. A hypertrophied masseter will alter facial lines, cause generating discomfort, and negative cosmetic impacts in many patients. Masseter hypertrophy leads to the prominent mandibular angle which is aesthetically unacceptable to the patient. The differential diagnosis includes parotid tumor, lipoma, benign or malignant muscle tumors, and vascular tumors
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