Introduction: Intramuscular haemangioma of Masseter Muscle is a rare benign neoplasm developing from abnormally differentiated blood vessels. Case report:We report in this article a case of an Haemangioma involving masseter muscle in a 16-year-old girl referred for progressive and unsightly swelling of the right cheek present since 2-years. Clinical examination showed a painless, well circumscribed, and firm swelling in the right cheek. Facial CT Scan with contrast injection revealed a highdensity region in the right masseteric muscle without bone lysis. MRI showed voluminous encapsulated tissue mass in isosignal T1 and T2 in the right masseter muscle. The patient was operated externally by performing an exo-facial parotidectomy with tumorectomy. Discussion:The masseter muscle localization of intramuscular hemangioma represents the most common site (36%), followed by trapezius. Excessive muscle contractions and trauma seem to be important factors in the development of this type of malformation. It is a mass of variable size, unique, mobile and firm. CT and MRI have significantly increased the accuracy of preoperative diagnosis for this lesion. They allow to define precisely its limits and its relations with the neighboring tissues. The treatment of choice is surgical excision of whole lesion with adjacent muscle. Conclusion:Intra masseter hemangiomas are rare tumors often mistakenly considered as parotid tumors. The essential radiological exam before treatment are CT with injection or MRI. Surgery is the reference treatment.
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