Development of the brainstem: assessment by MR imaging

Area of Science:

• Neuroscience
• Developmental Biology
• Radiology

Background:

• Understanding brainstem development is crucial for diagnosing congenital abnormalities and developmental disorders.
• Previous studies have utilized various imaging techniques, but detailed morphological analysis across a wide age range is limited.

Purpose of the Study:

• To investigate the morphological development of the brainstem using Magnetic Resonance (MR) imaging.
• To analyze the relationship between brainstem growth and cranial size across different developmental stages.
• To identify potential sex-based differences in brainstem morphology during development.

Main Methods:

• MR imaging was performed on 74 subjects aged 4 months to 16 years, plus 6 adult cases.
• Brainstem growth patterns were analyzed, categorizing relationships with cranial size into linear, plateau, down-and-up, and exponential types.
• Statistical analysis was conducted to identify significant sex differences in specific brainstem measurements.

Main Results:

• Brainstem development exhibited rapid growth until 4-6 years, followed by a slower growth phase, demonstrating exponential patterns.
• Four distinct types of relationships between brainstem growth and cranial size were identified.
• Significant sex differences were observed in adolescent subjects (10-16 years) for brainstem size in axial view (v, z) and midbrain-to-cranium ratio in sagittal view (t/T-P), with males showing larger values.

Conclusions:

• The brainstem undergoes significant morphological development characterized by rapid early growth and distinct relationships with cranial size.
• Sex-based dimorphism in brainstem morphology becomes apparent during adolescence.
• MR imaging provides valuable insights into normative brainstem development and potential sex-related variations.