Capillary telangiectasia on MR imaging

Capillary telangiectasia is a cluster of enlarged, dilated capillaries interspersed with normal brain parenchyma

• General features
  • Common sites: Pons, cerebellum, spinal cord
  • Usually < 1 cm
  • CT
    • Usually normal
  • MR
    • T1WI
      – Usually normal
    • T2WI
      – 50% normal on T2WI
      – 50% show faint stippled foci of hyperintensity
    • Large capillary telangiectasias may show ill-defined FLAIR hyperintensity
    • Moderately hypointense on GRE; profoundly hypointense on SWI
    • T1 C+
      – Shows faint stippled or speckled brush-like enhancement
      – Large capillary telangiectasia typically contain prominent linear draining
      vein(s)

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