title: When is a GIST not a GIST? A case report of synchronous metastatic gastrointestinal stromal tumor and fibromatosis.
abstract: BACKGROUND
  A number of non-malignant diseases that share similar morphological features as gastrointestinal stromal tumor (GIST) have been reported. Co-existence of GIST with these other diseases is rarely recognized or reported.
  
  
  METHODS
  We report a case of a 62 year-old man with long-term stable control of metastatic GIST with systemic therapy, presented with an apparent intra-abdominal progression but not supported by imaging with positron emission tomography. Subsequent resection of the intra-abdominal tumor identified a non-malignant fibroid.
  
  
  CONCLUSIONS
  Differentiating localized progression of GIST from other diseases has important prognostic and therapeutic implications. The potential for co-existence of non-malignant soft tissue neoplasm should always be considered.
authors.affiliation: Department of Medical Oncology, Prince of Wales Hospital, NSW, Australia. cklee1976@yahoo.com
authors.forename: Chee Khoon
authors.initials: CK
authors.lastname: Lee
authors.forename: Alison
authors.initials: A
authors.lastname: Hadley
authors.forename: Keshani
authors.initials: K
authors.lastname: Desilva
authors.forename: Gareth
authors.initials: G
authors.lastname: Smith
authors.forename: David
authors.initials: D
authors.lastname: Goldstein
mesh_terms: D003937:Diagnosis, Differential; D005350:Fibroma / Q000175:diagnosis* / Q000601:surgery; D046152:Gastrointestinal Stromal Tumors / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography; D019009:Proto-Oncogene Proteins c-kit / Q000378:metabolism; D014057:Tomography, X-Ray Computed
chemical_list: D019009:Proto-Oncogene Proteins c-kit