title: Brain parenchymal infection in bone marrow transplantation patients: CT and MR findings.
abstract: OBJECTIVE
  The purpose of this study was to assess the MR and CT appearance of brain infection after bone marrow transplantation and to correlate the appearances with laboratory and pathologic findings.
  
  
  METHODS
  We retrospectively reviewed the records of seven bone marrow transplant recipients with radiologic evidence of brain infection.
  
  
  RESULTS
  Forty-one lesions were detected in seven patients with proved infectious foci outside the brain before brain infection was suspected clinically. Six patients had low total WBC or lymphocyte counts and one patient had normal total WBC and lymphocyte counts. Most lesions in patients with low total WBC or lymphocyte counts showed no appreciable edema or contrast enhancement. However, all lesions detected in the patient with normal total WBC and lymphocyte counts showed marked vasogenic edema and ring enhancement.
  
  
  CONCLUSIONS
  Brain infection in bone marrow transplant recipients during immunosuppression exhibited MR characteristics different from those typically seen in immunocompetent patients. This appearance may be related to a diminished immunologic/inflammatory response.
authors.affiliation: Department of Radiology, University of Iowa College of Medicine, Iowa City 52242.
authors.forename: W T
authors.initials: WT
authors.lastname: Yuh
authors.forename: H D
authors.initials: HD
authors.lastname: Nguyen
authors.forename: F
authors.initials: F
authors.lastname: Gao
authors.forename: E T
authors.initials: ET
authors.lastname: Tali
authors.forename: D J
authors.initials: DJ
authors.lastname: Fisher
authors.forename: N A
authors.initials: NA
authors.lastname: Mayr
authors.forename: D P
authors.initials: DP
authors.lastname: Mueller
authors.forename: Y
authors.initials: Y
authors.lastname: Sato
authors.forename: M E
authors.initials: ME
authors.lastname: Trigg
authors.forename: R
authors.initials: R
authors.lastname: Gingrich
mesh_terms: D000328:Adult; D001228:Aspergillosis / Q000175:diagnosis*; D016026:Bone Marrow Transplantation; D001922:Brain Abscess / Q000175:diagnosis / Q000382:microbiology*; D003586:Cytomegalovirus Infections / Q000175:diagnosis*; D005260:Female; D006566:Herpesviridae Infections / Q000175:diagnosis*; D004854:Herpesvirus 4, Human / Q000302:isolation & purification*; D006801:Humans; D007165:Immunosuppression Therapy / Q000009:adverse effects*; D008279:Magnetic Resonance Imaging; D008297:Male; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D014412:Tumor Virus Infections / Q000175:diagnosis*