TABLE 1.

Eligibility criteria for participants with A‐T.

Inclusion criteria	Exclusion criteria
Confirmed diagnosis of A‐T	Contra‐indication to MRI scan
Aged 4–18 years
Able to undergo MRI scan without sedation or general anaesthetic, after age‐appropriate preparation
Able to give informed consent (if 16 or older), or have a parent or guardian who is able to give informed consent