title: Implantation metastasis along the stereotactic biopsy tract in anaplastic astrocytoma: a case report.
abstract: OBJECTIVE
  Stereotactic biopsy for brain lesion is usually a safe procedure and the reported rate of complication is minimal. Moreover, local seeding along the trajectory of the stereotactic biopsy is arare complication. The authors report a case of metastatic implantation along the trajectory of the stereotactic biopsy in anaplastic astrocytoma.
  
  
  METHODS
  A 64-year-old man who presented with a one-month history of speech and memory disturbance underwent magnetic resonance (MR) imaging that disclosed a large mass in the left basal ganglia and medial temporal region.
  
  
  METHODS
  Under the impression of high-grade glioma, computed tomography guided stereotactic biopsy was performed using the Riechert-Mundinger system. The histologic diagnosis was anaplastic astrocytoma. MR images after two cycles of chemotherapy showed a small enhancing portion in the middle of the biopsy tract, which was considered a surgical artifact and not included in the field of the following conventional fractionated radiation therapy. MR images three months after the completion of radiation therapy revealed that the enhancing portion had become a larger mass irrespective of good control of the primary tumor.
  
  
  CONCLUSIONS
  Our findings suggest that tumor seeding along the stereotactic biopsy trajectory must be considered if an enhancing lesion appears in the MR image following the stereotactic biopsy. The cause and the prevention of implantation metastasis along the stereotactic biopsy tract are also discussed.
authors.affiliation: Department of Neurosurgery, Seoul National University College of Medicine, Clinical Research Institute, Seoul National University Hospital, Seoul, Korea.
authors.forename: Jeong E
authors.initials: JE
authors.lastname: Kim
authors.forename: Chae-Yong
authors.initials: CY
authors.lastname: Kim
authors.forename: Dong G
authors.initials: DG
authors.lastname: Kim
authors.forename: Hee-Won
authors.initials: HW
authors.lastname: Jung
mesh_terms: D001254:Astrocytoma / Q000473:pathology* / Q000556:secondary / Q000628:therapy; D001707:Biopsy, Needle / Q000009:adverse effects*; D001932:Brain Neoplasms / Q000473:pathology* / Q000556:secondary / Q000628:therapy; D003131:Combined Modality Therapy; D005500:Follow-Up Studies; D006801:Humans; D007723:Korea; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009366:Neoplasm Seeding; D013238:Stereotaxic Techniques / Q000009:adverse effects