title: The "mini brain": plasmacytoma in a vertebral body on MR imaging.
abstract: OBJECTIVE
  Patients with solitary plasmacytoma in the spine frequently require a biopsy for diagnosis of their condition. We report an appearance of plasmacytoma in the spine, which is sufficiently pathognomonic to obviate biopsy.
  
  
  CONCLUSIONS
  Identification of a "mini brain" in an expansile lesion in the spine is characteristic of plasmacytoma. It is important that radiologists note this characteristic because biopsy can be avoided in patients with this appearance. Although biopsy might still be required at many institutions, at our institution, surgeons find this appearance sufficiently pathognomonic to bypass biopsy and start treatment.
authors.affiliation: Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA.
authors.forename: N M
authors.initials: NM
authors.lastname: Major
authors.forename: C A
authors.initials: CA
authors.lastname: Helms
authors.forename: W J
authors.initials: WJ
authors.lastname: Richardson
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010954:Plasmacytoma / Q000473:pathology*; D013120:Spinal Cord Neoplasms / Q000473:pathology*