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X-linked recessive aqueductal stenosis without macrocephaly.
R I Kelley1, M T Mennuti, W F Hickey
1Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia.
Clinical Genetics
|May 1, 1988
Summary
X-linked aqueductal stenosis (XLAS) can present as diffuse central nervous system (CNS) disease, not just aqueductal stenosis. Early prenatal diagnosis is crucial for this variable genetic condition.
Area of Science:
- Medical Genetics
- Neurology
- Developmental Biology
Background:
- X-linked aqueductal stenosis (XLAS) is a rare genetic disorder.
- It is characterized by narrowing of the cerebral aqueduct, leading to hydrocephalus.
- The condition can present with variable neurological and physical manifestations.
Observation:
- A case study of a family with a history of aqueductal stenosis.
- A male infant presented with severe intellectual disability and normocephaly.
- Computerized tomography confirmed aqueductal stenosis.
- Prenatal monitoring revealed fetal hydrocephalus after 20 weeks gestation.
- Fetal autopsy showed diffuse central nervous system (CNS) malformations alongside aqueductal stenosis.
Findings:
- This case highlights that X-linked aqueductal stenosis (XLAS) can manifest as a broader spectrum of CNS disease.
- Normocephalic, non-dysmorphic mentally retarded males should be evaluated for this variable syndrome.
- Prenatal diagnostic methods like ultrasonography and amniocentesis can aid in early detection.
Implications:
- Emphasizes the importance of considering XLAS in males with unexplained intellectual disability and normal head circumference.
- Underscores the utility of advanced imaging and genetic counseling in diagnosing complex congenital neurological disorders.
- Suggests a need for further research into the genetic and phenotypic variability of XLAS.