L1 syndrome
Synonyms: CRASH syndrome | Corpus callosum hypoplasia-retardation-adducted thumbs-spasticity-hydrocephalus syndrome | L1CAM syndrome
A rare congenital X-linked developmental disorder characterized by hydrocephalus of varying degrees of severity intellectual deficit spasticity of the legs and adducted thumbs. The syndrome represents a spectrum of disorders including: X-linked hydrocephalus with stenosis of the aqueduct of Sylvius (HSAS) MASA syndrome X-linked complicated hereditary spastic paraplegia type 1 and X-linked complicated corpus callosum agenesis.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview.
Reference: Access aggregated data from Orphanet at Orphadata.
Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version March 2024
Newly diagnosed with
L1 syndrome?
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Advocacy Organizations
COMBINEDBrain Inc
COMBINEDBrain is a consortium for outcome measures and biomarkers for neurodevelopmental disorders. We are collaborating to cure rare, non-verbal brain disorders.
DDX3X Foundation
Our mission is to connect families, resources, and the medical community to advance research for a treatment or cure to DDX3X Syndrome. Our ultimate goal is to accelerate brain function in individuals affected by DDX3X Syndrome through advances in cell and gene therapy and pharmaceuticals.
Moonshots for Unicorns
Curing single-gene disorders
National Organization for Disorders of the Corpus Callosum
The NODCC has become the leading organization for disorders of the corpus callosum seeking to raise the profile, understanding and acceptance of these disorders through education, networking, advocacy, and being a catalyst for research.
Project CASK
To fund research for treatment and/or a cure for CASK Gene Disorder
Syndromes Without A Name (SWAN) Australia
Provide information, support and advocacy to families caring for a child with an undiagnosed or rare genetic condition.
Clinical Trials
For a list of clinical trials in this disease area, please click here.