title: [Brain abscess as the first clinical manifestation of isolated pulmonary arteriovenous malformation without Rendu-Osler disease].
abstract: BACKGROUND
  Brain abscesses occur in 5 to 13 % of patients with pulmonary arteriovenous malformation (PAVM), more often present in Rendu-Osler-Weber disease or hereditary hemorrhagic telangiectasia (HHT).
  
  
  METHODS
  A 51-year-old man with a history of transient Parinaud syndrome at 37 years complained of headache for 2 months before acute onset of a left cerebellar syndrome without fever. CT-scan and MRI of the head revealed a heterogeneous left cerebellar lesion. A brain abscess was drained and all signs resolved. CT-scan of the chest revealed a left lingual PAVM; occlusion was incomplete after coil embolization. He had no feature of HHT and no mutation in ENG and ACVRL1 genes. A second embolization was performed 5 months later, but the malformation was not occluded at 6 months.
  
  
  CONCLUSIONS
  We report the seventh case of PAVM complicated by a cerebellar abscess. The right to left shunt in PAVM results in hypoxemia, secondary polycythemia and paradoxical embolization of infective organisms bypassing the pulmonary filter.
  
  
  CONCLUSIONS
  Combining different MRI techniques (in particular diffusion and proton MR spectroscopy) provides invaluable data for the diagnosis of brain abscess. Careful search for PAVM must be undertaken, particularly in adults with cryptogenic abscess, to avoid further abscess formation or stroke.
authors.affiliation: Service de neurologie, HIA Desgenettes, 108, boulevard Pinel, 69275 Lyon cedex 3, France. drouetalain@yahoo.fr
authors.forename: A
authors.initials: A
authors.lastname: Drouet
authors.forename: F
authors.initials: F
authors.lastname: Le Moigne
authors.forename: A
authors.initials: A
authors.lastname: Donat
authors.forename: L
authors.initials: L
authors.lastname: Guilloton
authors.forename: D
authors.initials: D
authors.lastname: Felten
mesh_terms: D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001165:Arteriovenous Malformations / Q000150:complications / Q000175:diagnosis* / Q000628:therapy; D001922:Brain Abscess / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology* / Q000601:surgery; D002526:Cerebellar Diseases / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D003399:Craniotomy; D004322:Drainage; D019320:Embolism, Paradoxical / Q000209:etiology; D004621:Embolization, Therapeutic; D005674:Fusobacterium Infections / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology / Q000601:surgery; D005675:Fusobacterium necrophorum; D006192:Haemophilus Infections / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology / Q000601:surgery; D006801:Humans; D000860:Hypoxia / Q000209:etiology; D019586:Intracranial Hypertension / Q000209:etiology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011086:Polycythemia / Q000209:etiology; D011651:Pulmonary Artery / Q000002:abnormalities*; D011667:Pulmonary Veins / Q000002:abnormalities*; D013290:Streptococcal Infections / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology / Q000601:surgery; D034367:Streptococcus intermedius
chemical_list: D000900:Anti-Bacterial Agents