What are the MRI characteristics of white matter myelination in a 24-month-old child on T2-weighted images?

By 24 months, the white matter appears dark on T2-weighted MRI, indicating mature myelination, although some minimal high-signal areas may persist in peripheral regions. Key diagnostic features include the transition from high to low signal intensity in white matter as myelination progresses. Clinically, recognizing normal myelination patterns helps differentiate between developmental delay and pathological conditions. A common pitfall is mistaking persistent high-signal areas for demyelinating disorders, which can be avoided by correlating with clinical history and other imaging findings.