title: An intrasylvian "fibroma" in a child with cystic fibrosis: case report.
abstract: OBJECTIVE
  Intracranial fibrous tumors are uncommon during childhood. An unusual case of benign intrasylvian "fibroma" that has remained clinically and radiographically stable more than 3 years after a subtotal resection is described.
  
  
  METHODS
  A 9-year-old girl with cystic fibrosis presented with new-onset focal seizures referable to a large calcified left sylvian fissure mass.
  
  
  METHODS
  An open biopsy with subtotal resection of the lesion revealed a benign process characterized by exuberant fibrocollagenous tissue intermeshed with chronic inflammatory cells and foreign body giant cells, encompassing islands of gliotic brain tissue. Immunohistochemical analysis showed staining for epithelial membrane antigen and reticulin within some of the spindle cells, although the majority were nonreactive. The majority of tumor cells exhibited staining for laminin; CD34 staining was absent. Ultrastructural studies were also suggestive of a fibroblastic rather than a meningothelial origin of the lesion, with elongated cells separated by abundant extracellular collagen. Although dense adherence of the mass to the pial surface and the middle cerebral artery vessels precluded a complete resection, the patient remains seizure-free without anticonvulsant therapy more than 3 years postoperatively with no evidence of growth of the lesion.
  
  
  CONCLUSIONS
  The lesion in this patient bears morphological similarity to a rare group of tumors referred to as "intracerebral fibromas," although a variety of other rare mesenchymal neoplasms were also considered within the differential diagnosis. However, the absence of any definite neoplastic features, the finding of chronic inflammatory changes, and the lack of growth of the residual tumor during an extended follow-up interval indicate that the mass may represent either an extremely indolent neoplasm or a nonneoplastic process. The differential diagnosis of intracranial fibrous tumors is contrasted with that of the reported case.
authors.affiliation: Department of Neurosurgery, Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pennsylvania 15213, USA.
authors.forename: L F
authors.initials: LF
authors.lastname: Pollack
authors.forename: R L
authors.initials: RL
authors.lastname: Hamilton
authors.forename: C
authors.initials: C
authors.lastname: Fitz
authors.forename: D M
authors.initials: DM
authors.lastname: Orenstein
mesh_terms: D001932:Brain Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D002535:Cerebral Aqueduct; D002648:Child; D003550:Cystic Fibrosis / Q000150:complications*; D003937:Diagnosis, Differential; D005260:Female; D005350:Fibroma / Q000150:complications* / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D012074:Remission Induction; D012640:Seizures / Q000209:etiology; D014057:Tomography, X-Ray Computed