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T2 hyperintense signal of the central tegmental tracts in children: disease or normal maturational process?
Sergio Aguilera-Albesa1, Andrea Poretti, Dagmar Honnef
1Pediatric Neurology Unit, Department of Pediatrics, Navarra Health Service, Pamplona, Spain.
Insights
Central tegmental tract hyperintensity (CTTH) on MRI appears to be a normal physiological process related to infant brain maturation. While seen in West syndrome patients, vigabatrin therapy has minimal impact, suggesting other factors may modify this process.
Area of Science:
- Neuroimaging
- Pediatric Neurology
- Radiology
Background:
- Cerebral central tegmental tract hyperintense signal on T2-weighted MRI (CTTH) is observed in diverse conditions, including West syndrome (WS) with vigabatrin (VGB) treatment, hypoxic-ischemic brain injury, and metabolic diseases.
- The varied clinical presentations suggest CTTH might reflect an underlying physiological process rather than a specific pathology.
Purpose of the Study:
- To investigate the nature of CTTH by analyzing MRI data across different pediatric groups.
- To determine if CTTH is a physiological maturation-related process and assess the influence of VGB therapy in West syndrome.
Main Methods:
- Retrospective analysis of brain MRI data from four groups: WS with VGB therapy (WS+VGB+), WS without VGB therapy (WS+VGB-), other neurological diseases (WS-VGB-), and age-matched controls.
- Focus on the central tegmental tracts, with control group age limited to 25 months to capture the peak age of WS.
Main Results:
- CTTH prevalence was 24% in WS+VGB+, 12% in WS+VGB-, 6% in WS-VGB-, and 7% in controls.
- CTTH peaked in early infancy (4 months to 7 years) and was independent of diagnosis, suggesting a physiological basis.
- While VGB therapy showed minor impact, CTTH was more frequent in WS patients (7/40) compared to age-matched controls (8/112) under 25 months.
Conclusions:
- CTTH appears to be a physiological process linked to brain maturation in infants and young children.
- The increased prevalence of CTTH in West syndrome patients suggests that this physiological process can be influenced by endogenous or exogenous factors specific to the condition.
Introduction:
Cerebral central tegmental tract hyperintense signal on T2-weighted MRI (CTTH) is known from various clinical conditions, including children treated with vigabatrin (VGB) for West syndrome (WS), with hypoxic-ischemic brain injury, and metabolic diseases. Considering this clinical diversity, we hypothesized that CTTH might primarily mirror a physiologic process.
Methods:
We retrospectively analysed brain MRI data of the central tegmental tracts deriving from four different groups: (1) children with WS and VGB therapy (WS+VGB+), (2) children with WS but without VGB therapy (WS+VGB-), (3) children with different neurological diseases (WS-VGB-; maximum age 15 years), and (4) controls younger than 25 months of age (this age includes the peak age of WS).
Results:
CTTH were detected in 4/17 WS+VGB+ children (24%), 4/34 WS+VGB- children (12%), 18/296 WS-VGB- children (6%), and 8/112 controls (7%). Independently from the underlying diagnosis, CTTH showed a peak age during early infancy and were not found before 4 months and after 7 years of life. The rate of CTTH among WS children ± VGB therapy was similar so that VGB therapy seems of minor etiological impact. However, comparison of WS patients younger than 25 months of age (CTTH present in 7/40) with age-matched controls (CTTH present in 8/112) revealed that CTTH tend to be more frequent among WS patients in general.
Conclusions:
Our study suggests that CTTH represents a physiological maturation-related process. The high prevalence of CTTH among patients with WS indicates that this physiological process may be modified by additional endo- or exogeneous factors.
