title: Natural course of desmoid-type fibromatosis.
abstract: BACKGROUND
  Desmoid-type fibromatosis is a locally aggressive tumor known to have high potential for local recurrence after resection, while it exhibits self-limiting behavior and shows growth arrest or spontaneous regression in many patients. Thus, its natural course is not well known, and the proper treatment has not yet been established.
  
  
  METHODS
  We retrospectively reviewed clinical outcome and changes in tumor size in 11 consecutive patients with extremity and trunk desmoid-type fibromatoses, who were basically observed without any treatment after diagnosis.
  
  
  RESULTS
  For two patients in whom the tumors were initially incorrectly diagnosed as other tumors, surgical resection was performed. For another two patients, surgical resections were performed in the follow-up periods due to tumor enlargement or joint contracture. In all four patients who underwent surgery, tumors recurred shortly after resection and re-resection was not performed. During the follow-up periods with a median length of 56 months, ten tumors eventually stopped growing, and three of them regressed spontaneously. At the time of final follow-up, ten patients were alive with residual disease without severe morbidity. In one patient, the tumor enlarged to over 30 cm in diameter with a substantial functional deficit.
  
  
  CONCLUSIONS
  Simple observation is a noninvasive and function-preserving treatment for desmoid-type fibromatosis.
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Tomitaka
authors.initials: T
authors.lastname: Nakayama
authors.forename: Tadao
authors.initials: T
authors.lastname: Tsuboyama
authors.forename: Junya
authors.initials: J
authors.lastname: Toguchida
authors.forename: Taisuke
authors.initials: T
authors.lastname: Hosaka
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D000293:Adolescent; D000328:Adult; D015331:Cohort Studies; D005260:Female; D018222:Desmoid Tumors / Q000000981:diagnostic imaging / Q000473:pathology* / Q000628:therapy; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009365:Neoplasm Regression, Spontaneous; D010043:Outcome and Process Assessment, Health Care; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D047368:Tumor Burden