Investigations
- Low immunoglobulin levels e.g. IgA and IgG
- Elevated Alpha- fetoprotein levels (~95% of patients)
- Cerebellar atrophy on MRI

Image Source: Wikimedia Commons (1968). Ataxia Telangiectasia, Licensed under a creative commons licence. Available for free at: https://commons.wikimedia.org/wiki/File:Photo_Ocular_telangiectasia_in_a_person_with_A-T.jpg (Accessed 16 June 2025).
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