Development and aging of brain midline structures: assessment with MR imaging

Area of Science:

• Neuroscience
• Developmental Biology
• Radiology

Background:

• Understanding the developmental trajectory and aging process of critical brain midline structures is essential for diagnosing neurological disorders.
• The pituitary gland, pons, cerebellar vermis, and corpus callosum play vital roles in endocrine function, motor control, coordination, and interhemispheric communication.

Purpose of the Study:

• To analyze the developmental changes and aging patterns of the pituitary gland, pons, cerebellar vermis, and corpus callosum.
• To quantify the growth kinetics (linear vs. exponential) and age-related size changes in these four brain structures.

Main Methods:

• Midsagittal magnetic resonance imaging (MRI) was used to measure the dimensions and area of the four brain midline structures.
• A comprehensive study group included 94 pediatric patients (newborn to 15 years) and 56 adult participants (16 to 60 years).

Main Results:

• The pituitary gland exhibited linear growth, with notable spurts in the first year and during ages 10-15.
• The pons, cerebellar vermis, and corpus callosum demonstrated exponential growth, with the cerebellar vermis showing the most significant early growth spurt.
• In older adults (51-60 years), the pituitary gland decreased in size, and the corpus callosum showed a tendency toward diminution, while the pons and cerebellar vermis remained stable.

Conclusions:

• Brain midline structures exhibit distinct growth patterns throughout development, characterized by linear or exponential trajectories.
• Aging affects certain midline structures, notably the pituitary gland and corpus callosum, leading to size reduction in later life.
• These findings provide normative data for brain midline structure development and aging, crucial for clinical and research applications.