Abstract
Myofibroma, first reported by Stout in 1954, is a solitary tumor primarily found in the skin, bones, and gastrointestinal tract of infants. Its occurrence is as rare as two to four cases per one million people and, so far, only 19 cases have been reported in Japan. We report a case of myofibroma in the left mandibular molar gingiva of a 7-year-old boy. He noticed swelling in the left lower mandibular molar region one month before his first visit to our department, after which he consulted the referring hospital. A biopsy was performed at the referring hospital, and he was diagnosed with a benign mesenchymal tumor and referred to our department. At the initial consultation, we observed an elastic hard mass measuring 30 × 21 mm with normal surface mucosa. The tumor was resected under general anesthesia, and a histopathological examination of the resected specimen led to a diagnosis of myofibroma. There is no evidence of recurrence six years after surgery.
