オトガイ部知覚異常を初発症状とした側頭下窩に進展した筋肉内脂肪腫の1例

Abstract

An intramuscular lipoma is a deep-seated heterotopic benign mesenchymal tumor that originates in a skeletal muscle and infiltrates the adjacent muscle. It tends to recur after excision. This tumor is also referred to as “infiltrating lipoma" and differential diagnosis from well-differentiated liposarcoma is necessary.Intramuscular lipoma is very rare in the oral and maxillofacial region. We describe a case of intramuscular lipoma occurring in the musculus pterygoideus medialis or lateralis that spread to the infratemporal fossa in association with mental nerve neuropathy in a 59-year-old man. With the patient under general anesthesia, we excised the tumor, including the circumferential tissue. At the 2.5-year postoperative evaluation, numbness had improved, with no evidence of recurrence.