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Imaging of common congenital anomalies of the brain and spine
1Department of Radiology, University of Texas Medical School, Houston.
Insights
This review covers major congenital brain anomalies, focusing on structural defects present at birth. It illustrates key central nervous system (CNS) abnormalities using advanced imaging techniques.
Area of Science:
- Neurology
- Developmental Biology
- Medical Imaging
Background:
- Congenital anomalies are present before or at birth, often manifesting as structural defects in the central nervous system (CNS).
- The CNS begins development early in intrauterine life, with myelination continuing into infancy.
- Understanding the timing of developmental insults is crucial for classifying CNS abnormalities.
Purpose of the Study:
- To review major congenital brain anomalies based on the timing of the insult during development.
- To illustrate key CNS abnormalities using various imaging modalities.
- To provide an overview of significant congenital brain defects without aiming for exhaustive coverage.
Main Methods:
- Review of major central nervous system (CNS) abnormalities.
- Classification of anomalies based on the timing of the developmental insult.
- Illustration of anomalies using ultrasound (US), computed tomography (CT), and magnetic resonance (MR) imaging.
Main Results:
- The article categorizes congenital brain anomalies by the stage of intrauterine or early postnatal development when the insult occurred.
- Key structural abnormalities of the CNS are presented and visualized through US, CT, and MR imaging.
- The review highlights significant examples of congenital brain anomalies, emphasizing their imaging characteristics.
Conclusions:
- Congenital brain anomalies represent structural defects with diverse origins during development.
- Advanced imaging techniques like US, CT, and MR are essential for diagnosing and characterizing these conditions.
- A time-based classification aids in understanding the pathogenesis and presentation of major CNS abnormalities.
Abstract:
The term congenital anomalies refers to those processes that are present before or at birth. In congenital brain anomalies these defects are usually manifested as structural abnormalities. The central nervous system (CNS) starts forming at approximately the 17th day of intrauterine life and myelination is almost completed at about the 18th month of life when the brain reaches adult characteristics. For the purpose of this article, the major CNS abnormalities are reviewed according to the time of insult, beginning with the earlier ones. This article does not attempt to be a complete review; the emphasis is on illustrating the most important CNS anomalies utilizing ultrasound (US), computed tomography (CT), and magnetic resonance (MR) imaging.