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Temporal arachnoid cysts: are they congenital?
Hamilton Matushita1, Daniel Dante Cardeal2, Fernanda Gonçalves de Andrade2
1Department of Neurosurgery, Division of Pediatric Neurosurgery, University of São Paulo, Avenida Dr. Eneas Carvalho de Aguiar 255, São Paulo, 05403900, Brasil. matushita@uol.com.br.
Summary
Arachnoid cysts (ACs) were diagnosed later in childhood, suggesting some may develop after birth. This challenges the assumption that all ACs are congenital, supporting a postnatal origin for some cases.
Area of Science:
- Neurology
- Pediatrics
- Radiology
Background:
- Arachnoid cysts (ACs) are typically considered congenital malformations.
- Early detection via prenatal or neonatal screening is often assumed.
Observation:
- Two cases of ACs were diagnosed at 10 months and 6 years of age.
- Neither cyst was detected during pregnancy or immediately after birth.
- One case became symptomatic, while the other was an incidental finding after head trauma.
Findings:
- These cases suggest a postnatal pathogenesis for some arachnoid cysts.
- Literature review supports the hypothesis of acquired ACs.
Implications:
- The findings challenge the universal congenital origin of ACs.
- This may influence diagnostic approaches and understanding of AC development.
- Further research into postnatal AC pathogenesis is warranted.
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