title: Pseudo-subarachnoid hemorrhage in cerebellar infarction.
abstract: BACKGROUND
  The computed tomography (CT) appearance of subarachnoid hemorrhage (SAH) without subarachnoid blood has been labeled "pseudo-subarachnoid hemorrhage" (pseudo-SAH) and has been reported with several diffuse intracerebral insults including intrathecal contrast agents, meningitis, generalized cerebral edema, anoxic encephalopathy, and intracranial hypotension.
  
  
  METHODS
  Single case report.
  
  
  RESULTS
  We present a 43-year-old female who presented with vertigo and severe headache. Initial CT brain suggested SAH with hydrocephalus. Subsequent cerebral angiography was negative. Cerebrospinal fluid from an external ventricular drain (EVD) was negative for blood, and MRI brain revealed an acute stroke in the posterior inferior cerebellar artery (PICA) territory.
  
  
  CONCLUSIONS
  Our case suggests that PICA infarction can be associated with the CT finding of pseudo-SAH, thereby mimicking the clinical and radiographic presentation of SAH.
authors.affiliation: Department of Neurologic Sciences, Rush University Medical Center, 1725 W. Harrison Street, Suite #1106, Chicago, IL 60612, USA. Brandon_r_barton@rush.edu
authors.forename: Brandon R
authors.initials: BR
authors.lastname: Barton
authors.forename: Shyam
authors.initials: S
authors.lastname: Prabhakaran
authors.forename: Demetrius K
authors.initials: DK
authors.lastname: Lopes
authors.forename: Vivien H
authors.initials: VH
authors.lastname: Lee
mesh_terms: D000208:Acute Disease; D000328:Adult; D020520:Brain Infarction / Q000000981:diagnostic imaging*; D002526:Cerebellar Diseases / Q000000981:diagnostic imaging*; D005260:Female; D006261:Headache / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed