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Capillary Telangiectasia

Last Updated: October 1, 2018

Figure 1: Capillary telangiectasias of the CNS are asymptomatic/subclinical, low-flow vascular lesions. The lesion is characterized by dilated capillaries interspersed within normal parenchyma (in contrast tocavernous malformationswhich have no normal interposed parenchyma). The vast majority occur as incidental findings within thepons,cerebellumand/or spinal cord as a small focus of enhancement on MRI. There is an association with Osler-Weber-Rendu syndrome. The lesion becomes important in the differential diagnosis of vascular lesions, though atypical lesions can mimic glioma, metastasis, and/or demyelinating plaque.


  • CT
    • Usually not visible on CT, before or after contrast administration
  • MRI

    • Findings
      • The lesion is nearly always detected on MRI versus other modal...