How do I know if I have Autosomal recessive multiple pterygium syndrome / Escobar syndrome?

Autosomal recessive multiple pterygium syndrome, also known as Escobar syndrome, is a rare genetic condition typically identified at birth through physical features like joint contractures and webbing (pterygia) of the neck or armpits. If you suspect you or a family member has this condition, diagnosis relies on clinical evaluation by a geneticist and specific molecular genetic testing of the CHRNG gene.

What are the primary clinical signs of Escobar syndrome?

Autosomal recessive multiple pterygium syndrome is characterized by a specific pattern of physical findings. The most prominent feature is multiple pterygia—webbing of the skin across joints—most commonly affecting the neck, elbows, and knees. Individuals with Escobar syndrome often present with joint contractures (limitation in movement) and a small stature. Unlike other forms of multiple pterygium syndrome, individuals with this specific autosomal recessive type usually have normal intelligence and do not typically exhibit the severe neurological or structural heart defects seen in lethal variants.

How is a diagnosis of Autosomal recessive multiple pterygium syndrome confirmed?

A diagnosis of Autosomal recessive multiple pterygium syndrome is made through a combination of clinical observation and genetic confirmation. Because this is a rare condition, it is essential to consult with a clinical geneticist. Common diagnostic steps include:

• A comprehensive physical examination to document the extent of joint contractures and skin webbing.


• Molecular genetic testing to identify biallelic (two-copy) pathogenic variants in the CHRNG gene.


• Detailed family history analysis to confirm the autosomal recessive inheritance pattern.

When should you seek medical evaluation?

If you or your child exhibit persistent joint stiffness, limited range of motion, or unusual skin folds that suggest Escobar syndrome, you should request a referral to a medical geneticist. It is important to distinguish between normal anatomical variation—such as minor joint laxity—and the structural contractures associated with Autosomal recessive multiple pterygium syndrome. If you feel your concerns are being dismissed, ask for a formal referral to a specialized center for rare genetic disorders or consult the resources at DiseaseMaps.org to connect with others who have navigated the diagnostic journey.

Next steps

• Schedule an appointment with a clinical geneticist to discuss your symptoms and family history.


• Request a panel test for the CHRNG gene if your physical symptoms align with Escobar syndrome.


• Join the DiseaseMaps.org community to connect with other families living with Autosomal recessive multiple pterygium syndrome.


• Keep a detailed log of joint mobility limitations to share during your clinical consultation.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Multiple pterygium syndrome, Escobar type.


• Orphanet: Autosomal recessive multiple pterygium syndrome.


• OMIM (Online Mendelian Inheritance in Man): Multiple Pterygium Syndrome, Escobar Type (#265000).