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Diagnosis: Arteriovenous malformation.

Radiology Findings

CT of the brain without contrast:

• Old left parietal encephalomalacia, likely gliosis.
  
• Focal 6 mm area of increased attenuation in the mid lateral left temporal lobe.
  

• Hyperintense T2 signal abnormality in the left parietal lobe consistent with gliosis, likely from old hemorrhage.
  
• In the left high parietal lobe, there is a 1.5 cm area of increased
  serpiginous flow voids with feeding and draining vessels that represents an arteriovenous malformation.
  
• Large draining cortical vein is seen on the left temporal region that is contiguous with the arteriovenous malformation.
  

• MRA demonstrates nidus of vessels in the left parietal region with connection to a large left cortical draining vein.
  

Differential Diagnosis

• Arteriovenous malformation.
  
• Anaplastic astrocytoma.
  
• Glioblastoma multiforme.
  
• Capillary telangiectasia.
  
• Cavernous angioma.
  
• Venous angioma.
  

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