title: Natural evolution of desmoplastic fibroblastoma on magnetic resonance imaging: a case report.
abstract: BACKGROUND
  Desmoplastic fibroblastoma (collagenous fibroma) is a recently described tumor thought to arise predominantly from subcutaneous tissue or skeletal muscle. The natural evolution of this tumor on magnetic resonance imaging has never been described, to the best of our knowledge. We herein report a case of desmoplastic fibroblastoma arising in the thigh and show the longitudinal magnetic resonance imaging findings.
  
  
  METHODS
  A 60-year-old Japanese man presented with swelling of the medial side of his right thigh, and he complained of nighttime pain and slight tenderness. Magnetic resonance imaging demonstrated a 4 × 4 cm mass in the right thigh. Open biopsy was performed. The mass was diagnosed histologically as a benign fibrous tumor, and we maintained follow-up without surgical therapy. After one year, magnetic resonance imaging showed an increase in tumor size to 4 × 5 cm, but the histologic findings were the same as those obtained one year earlier. Resection was performed with narrow surgical margins. Pathologic diagnosis was desmoplastic fibroblastoma. Two years after surgery, the patient is free from pain and shows no signs or symptoms of recurrence.
  
  
  CONCLUSIONS
  The natural evolution of desmoplastic fibroblastoma is characterized by no changes in patterns on magnetic resonance imaging despite increasing size. This finding is clinically helpful for distinguishing desmoplastic fibroblastoma with increasing pain from the desmoid tumor.
authors.affiliation: Department of Orthopaedic Surgery, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan. ukei@tc2.so-net.ne.jp.
authors.forename: Yusaku
authors.initials: Y
authors.lastname: Kamata
authors.forename: Ukei
authors.initials: U
authors.lastname: Anazawa
authors.forename: Hideo
authors.initials: H
authors.lastname: Morioka
authors.forename: Takeshi
authors.initials: T
authors.lastname: Morii
authors.forename: Keiko
authors.initials: K
authors.lastname: Miura
authors.forename: Makio
authors.initials: M
authors.lastname: Mukai
authors.forename: Hiroo
authors.initials: H
authors.lastname: Yabe
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Toyama