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Malformative intracranial cysts: diagnosis and outcome
Alain Pierre-Kahn1, Pascale Sonigo
1Department of Pediatric Neurosurgery, Groupe Hospitalier Necker-Enfants Malades, 149 rue de Sèvres, 75743 Paris Cedex 15, France. alain.kahn@nck.ap-hop-paris.fr
Summary
Most fetal intracranial cysts are benign and resolve spontaneously, leading to normal development. Accurate prognosis relies on assessing brain integrity, not cyst size, with fetal MRI being crucial for diagnosis.
Area of Science:
- Neuroimaging
- Fetal Medicine
- Pediatric Neurology
Background:
- Prenatal investigations enable monitoring of intracranial cysts from detection in utero through the postnatal period.
- Including cysts that remain silent postnatally provides valuable insights into their natural history.
Purpose of the Study:
- To analyze the natural history and prognosis of fetal intracranial cysts.
- To determine factors influencing clinical outcomes and the necessity of intervention.
Main Methods:
- Utilized prenatal imaging (including fetal MRI) to detect and follow intracranial cysts.
- Correlated imaging findings with postnatal clinical outcomes.
- Assessed the role of cyst characteristics and brain anatomy in prognosis.
Main Results:
- The majority of isolated intracranial cysts are benign, clinically silent, and often regress spontaneously.
- Surgery is rarely required, typically only for evolving hydrocephalus or expanding cysts.
- Clinical outcome is linked to brain integrity rather than cyst volume or location.
Conclusions:
- Accurate prognosis depends on detailed analysis of brain anatomy, with fetal MRI being essential.
- While rare, karyotype study is necessary due to potential chromosomal anomalies.
- Prenatal prognostication achieved approximately 90% accuracy, though differentiating certain retrocerebellar cysts remains challenging.