Syndrome with a Dandy-Walker malformation as a major feature

Syndrome with a Dandy-Walker malformation as a major feature (Orphanet code 269546) is a grouping category that encompasses several rare genetic syndromes in which the Dandy-Walker malformation (DWM) is a defining clinical characteristic. The Dandy-Walker malformation is a congenital brain abnormality involving the cerebellum and the fluid-filled spaces surrounding it. It is characterized by an enlarged posterior fossa (the space at the back of the skull), partial or complete absence of the cerebellar vermis (the area between the two hemispheres of the cerebellum), and cystic dilation of the fourth ventricle. These structural brain changes frequently lead to hydrocephalus (accumulation of cerebrospinal fluid in the brain), which can cause increased intracranial pressure, developmental delays, and motor difficulties. Because this Orphanet entry represents a broad category rather than a single disease entity, the associated syndromes vary widely in their additional features. Affected body systems may include the central nervous system, eyes, heart, kidneys, limbs, and craniofacial structures, depending on the specific syndrome. Common clinical features across many of these syndromes include intellectual disability, motor coordination problems (ataxia), hypotonia (low muscle tone), seizures, and various congenital malformations. Some syndromes in this group include Dandy-Walker malformation with intellectual disability, basal ganglia disease, and seizures; Joubert syndrome and related disorders; and other rare syndromic presentations. Treatment is largely supportive and symptom-based, as no curative therapy currently exists for the underlying malformations. Hydrocephalus, when present, may require surgical intervention such as ventriculoperitoneal shunt placement or endoscopic third ventriculostomy to relieve pressure. Physical therapy, occupational therapy, speech therapy, and special education services are commonly employed to optimize developmental outcomes. Regular monitoring by a multidisciplinary team including neurologists, neurosurgeons, ophthalmologists, and developmental specialists is recommended.

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