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Capillary Telangiectasia

Summary

  • Benign vascular malformation composed of dilated capillaries
  • Typically asymptomatic and found incidentally on imaging
  • Most commonly located in the pons, but can occur throughout the brain

Pathophysiology

  • Characterised by dilated capillary-sized vessels without intervening brain parenchyma
  • Lack of smooth muscle and elastic fibres in vessel walls
  • No evidence of cellular proliferation or neoplasia
  • May be associated with developmental venous anomalies (DVAs) in some cases

Demographics

  • Prevalence: 0.4-2% in autopsy series
  • No significant gender predilection
  • Can occur at any age, but most commonly diagnosed in adults

Diagnosis

  • Usually asymptomatic and discovered incidentally on imaging
  • Rarely associated with minor neurological symptoms:
    • Headaches
    • Dizziness
    • Focal neurological deficits (uncommon)
  • Differential diagnosis includes:
    • Low-grade gliomas
    • Demyelinating lesions
    • Small infarcts

Imaging

  • MRI is the modality of choice for diagnosis
  • T1-weighted imaging:
    • Isointense or slightly hypointense to brain parenchyma
  • T2-weighted imaging:
    • Mildly hyperintense
  • T2*-weighted imaging:
    • May show "brush-like" appearance due to dilated vessels
  • Post-contrast T1-weighted imaging:
    • Mild, homogeneous enhancement
    • "Brush-like" or "stippled" enhancement pattern
  • No mass effect or surrounding oedema
  • No restricted diffusion on DWI
  • DSC perfusion:
    • No significant increase in relative cerebral blood volume (rCBV)

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  • An incidental lesion shows reticular susecptibility artefact, hazy enhancement and is invisible on T2-weighted imaging.

Treatment

  • No treatment required for asymptomatic lesions
  • Regular follow-up imaging may be recommended to ensure stability
  • Symptomatic cases (rare):
    • Conservative management of symptoms
    • Surgical intervention generally not indicated due to benign nature and risk of complications
  • Patient education and reassurance about the benign nature of the lesion

Differential diagnosis

Differential Diagnosis Distinguishing Feature
Cavernous Malformation Lacks haemosiderin rim on MRI; no mass effect
Developmental Venous Anomaly Has characteristic "caput medusae" appearance on contrast-enhanced imaging
Arteriovenous Malformation Lacks arteriovenous shunting on angiography
Cerebral Metastasis Lacks surrounding oedema and mass effect; no enhancement on contrast MRI
Glioma No mass effect or surrounding oedema; lacks contrast enhancement
Multiple Sclerosis Plaque Lacks periventricular predilection; no enhancement on contrast MRI
Acute Small Infarct No restricted diffusion on DWI; lacks evolution over time
Petechial Haemorrhage No blooming artefact on susceptibility-weighted imaging
Hypertensive Microbleeds Lacks preferential distribution in basal ganglia, thalamus, or cerebellum
Radiation-Induced Telangiectasia Located within prior radiation field; may have associated white matter signal change and radiation necrosis