How do I know if I have Congenital bilateral perisylvian syndrome?

Congenital bilateral perisylvian syndrome (CBPS) is a rare neurological disorder primarily characterized by pseudobulbar palsy—manifesting as difficulty swallowing, speaking, and controlling facial muscles—alongside epilepsy and intellectual disability. Diagnosis is typically reached through clinical evaluation by a neurologist and confirmed via brain magnetic resonance imaging (MRI) showing characteristic bilateral perisylvian polymicrogyria.

What are the early signs and symptoms of Congenital bilateral perisylvian syndrome?

Because Congenital bilateral perisylvian syndrome is a congenital condition, signs are often noted in infancy or early childhood. The hallmark symptoms of Congenital bilateral perisylvian syndrome include profound oropharyngeal dysfunction, which leads to significant difficulty with feeding, sucking, and swallowing (dysphagia). Parents or caregivers may notice excessive drooling and a lack of facial expression. As the child develops, speech production becomes severely impaired or absent due to the inability to coordinate the muscles of the tongue, lips, and jaw. If you are an adult or adolescent wondering if you have this condition, it is important to note that Congenital bilateral perisylvian syndrome is not typically diagnosed for the first time in adulthood, as the structural brain changes are present from birth.

How is Congenital bilateral perisylvian syndrome diagnosed?

The diagnostic process for Congenital bilateral perisylvian syndrome involves a multi-disciplinary approach. If you suspect this condition, you should consult with a neurologist who specializes in developmental disorders. The following steps are typically involved in the diagnostic pathway:

• Clinical Examination: A neurological assessment focusing on cranial nerve function, specifically the muscles used for chewing, swallowing, and speech.


• Neuroimaging: An MRI of the brain is the gold standard for identifying the characteristic bilateral perisylvian polymicrogyria (an abnormal folding pattern of the brain's cortex).


• Genetic Testing: While the cause of Congenital bilateral perisylvian syndrome is often sporadic, clinicians may order chromosomal microarrays or whole-exome sequencing to rule out other genetic syndromes that present with similar neurological features.


• EEG Monitoring: Because epilepsy occurs in a significant portion of patients, an electroencephalogram (EEG) is frequently performed to monitor for seizure activity.

When should I seek medical evaluation for neurological symptoms?

If you or a loved one are experiencing persistent difficulties with swallowing, chronic choking, or unexplained seizure activity, it is time to consult a medical professional. When speaking with your doctor, be specific about the history of these symptoms. Use the term Congenital bilateral perisylvian syndrome and ask if a structural MRI of the brain has been considered to rule out cortical malformations. If you feel your concerns are being dismissed, request a referral to a tertiary care center or a university-affiliated pediatric neurologist who has experience with rare neurodevelopmental disorders.

What is the difference between normal variation and this condition?

It is important to distinguish between isolated speech delays and the complex constellation of symptoms found in Congenital bilateral perisylvian syndrome. Normal variations in development do not typically include the severe oropharyngeal paralysis, persistent drooling, and characteristic brain malformations seen in this condition. The 45 members of the DiseaseMaps.org community living with this diagnosis often emphasize that the combination of both physical motor deficits and cognitive or epileptic features is what differentiates this syndrome from other speech or developmental delays.

Next steps

• Schedule an appointment with a neurologist for a formal clinical assessment.


• Request a brain MRI to evaluate for perisylvian polymicrogyria.


• Connect with the community at DiseaseMaps.org to share experiences with others navigating the same diagnostic journey.


• Maintain a detailed log of symptoms, including frequency of seizures and specific difficulties with speech or swallowing, to provide to your specialist.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Congenital bilateral perisylvian syndrome entry.


• Orphanet: Portal for rare diseases and orphan drugs (ORPHA:99925).


• Online Mendelian Inheritance in Man (OMIM): Entry #300059 (Perisylvian Polymicrogyria).


• PubMed: Clinical studies on the neurological and developmental outcomes of polymicrogyria.