SCLEROTIC FIBROMA WITHIN A SCALENE MUSCLE : A CASE REPORT

• Published in: JIBI INKOKA TEMBO Vol. 62; no. 2; pp. 80 - 84
• Main Author: Maeda, Hiroyuki
• Format: Journal Article
• Language: Japanese
• Published: Society of Oto-rhino-laryngology Tokyo 15.04.2019
• Subjects: calcification; collagenous tissue; fibroma; fibrous tumor; supraclavicular fossa
• ISSN: 0386-9687; 1883-6429
• DOI: 10.11453/orltokyo.62.2_80

We describe the case of a 66-year-old male with sclerotic fibroma within the middle scalene muscle in the right supraclavicular fossa. The patient presented with a 3-year history of a lump in his right supraclavicular fossa and immobility of his right shoulder. A plain chest X-ray and cervical CT showed a round mass with calcification in the right supraclavicular fossa. The operative findings revealed a white mass wrapped by a rather thick capsule, infiltrating the muscle fibers of the middle scalene muscle. The removed tumor specimen was oval in shape and measured 70×50×30 mm in size. On histopathological examination, the inside of the mass was filled with degenerated thick collagenous material. There was no obvious regularity in the array of collagenous fibers and the fibers showed extreme twirling. Most of the tumor was composed of calcification or hyalinization, rather than cells. Based on these findings, the mass was diagnosed eventually as a sclerotic fibroma.　A sclerotic fibroma is considered as a benign tumor under the category of fibromas. However, we could find no reports in Japan of this tumor in the head and neck region.