How do I know if I have Cornelia de Lange Syndrome?

Cornelia de Lange Syndrome (CdLS) is a rare genetic condition typically identified in infancy or early childhood through a combination of distinct facial features, growth delays, and developmental challenges. Because symptoms vary significantly in severity, diagnosis requires a professional clinical evaluation and molecular genetic testing, as it cannot be accurately diagnosed through self-assessment alone.

What are the early signs and symptoms of Cornelia de Lange Syndrome?

Cornelia de Lange Syndrome is characterized by a wide spectrum of physical and developmental traits. In many cases, clinical suspicion arises due to specific facial features, such as highly arched eyebrows that often meet in the middle (synophrys), long eyelashes, a short nose with upturned nostrils, and thin, downturned lips. Beyond facial features, individuals with Cornelia de Lange Syndrome often exhibit prenatal and postnatal growth restriction, small stature, and small head size (microcephaly). Developmental delays and intellectual disabilities are common, ranging from mild to profound, often accompanied by limb differences, such as small hands or feet, or in some cases, the absence of forearms or fingers.

When should I consult a doctor about Cornelia de Lange Syndrome?

If you or your child exhibit a combination of the physical traits mentioned above alongside significant developmental delays or feeding difficulties in infancy, it is appropriate to consult a clinical geneticist. When speaking with your physician, be prepared to provide a detailed family history and a timeline of developmental milestones. It is helpful to present a list of specific concerns, such as:

• Persistent growth failure that does not respond to nutritional intervention.


• Distinctive physical features that have been noted by multiple observers.


• Developmental milestones that are significantly delayed compared to peers.


• Chronic gastrointestinal issues, which are reported in a high percentage of individuals with Cornelia de Lange Syndrome.

How is Cornelia de Lange Syndrome diagnosed?

There is no single "at-home" test for Cornelia de Lange Syndrome. A diagnosis is primarily clinical, meaning a doctor assesses your physical features and medical history. To confirm the diagnosis, medical professionals use molecular genetic testing. Mutations in genes such as NIPBL, SMC1A, SMC3, RAD21, or HDAC8 are identified in approximately 70% of clinical cases. If you feel your concerns are being dismissed, request a referral to a geneticist or a center specializing in rare genetic disorders. You have the right to advocate for a second opinion if you feel your symptoms—especially when they cluster together—are not being fully investigated.

What are the red flags requiring urgent evaluation?

While Cornelia de Lange Syndrome is a chronic condition, certain complications require immediate medical attention. Seek urgent care if there are signs of severe gastrointestinal distress (such as projectile vomiting or signs of internal pain), sudden changes in neurological function, or severe respiratory difficulties. These are not necessarily specific to Cornelia de Lange Syndrome but are known potential complications that require prompt clinical management.

Next steps

• Consult a clinical geneticist to discuss whether genetic testing is appropriate for your specific symptoms.


• Document all health concerns, including growth charts and developmental assessments, to share with specialists.


• Connect with the 133 community members on DiseaseMaps.org who have shared their experiences with Cornelia de Lange Syndrome to learn from their diagnostic journeys.


• Reach out to the CdLS Foundation for specialized resources and provider directories.

Medical Disclaimer: This content is for informational 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): Cornelia de Lange Syndrome


• Orphanet: Cornelia de Lange Syndrome (ORPHA: 199)


• Online Mendelian Inheritance in Man (OMIM): #122470 (CdLS1)


• Cornelia de Lange Syndrome Foundation (cdlsusa.org)