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Living with Bartsocas-Papas syndrome 1

A rare inherited condition with skin webbing behind the knees, facial clefts, and differences in the hands, feet, and skin.

Understanding Bartsocas-Papas syndrome 1

Bartsocas-Papas syndrome 1 is a rare inherited popliteal pterygium syndrome with severe skin webbing behind the knees and facial differences.

It includes a small head, fused eyelids, a small nose, facial clefts, fused or missing fingers and toes, and genital differences. It also affects skin and hair, with missing hair, eyebrows, lashes, and nails. Signs are seen during pregnancy and in the newborn period.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Skin webs behind the knees (popliteal pterygium)
  • Small head size (microcephaly)
  • Cleft palate and cleft lip
  • Eyelids that stick together
  • Fused or missing fingers and toes
  • Missing hair, eyebrows, and eyelashes

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include bone and joint specialists, ear, nose, and throat specialists, eye disease specialists and genetic specialists.

  3. Consider genetic testing

    Changes in RIPK4 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    World Craniofacial Foundation and National Foundation for Ectodermal Dysplasias may keep lists of experts for this condition.

Care & treatment

Care team
Bone and joint specialists (orthopedists or orthopedic surgeons); Ear, nose, and throat specialists (otolaryngologists); Eye disease specialists (ophthalmologists); Genetic specialists (geneticists)
Expert care
Expert lists: World Craniofacial Foundation, National Foundation for Ectodermal Dysplasias
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with World Craniofacial Foundation and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Can genetic testing for the RIPK4 gene confirm the diagnosis?
Which specialists should care for clefts and eyelids?
What is the chance of this happening again in a future pregnancy?

Quick facts

Symptoms usually startduring Pregnancy and as a Newborn
InheritanceAutosomal Recessive
GenesRIPK4

It is caused by changes in the RIPK4 gene. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticSkin

Also known as: autosomal recessive popliteal pterygium syndrome; bartsocas papas syndrome; bartsocas-papas syndrome; lethal popliteal pterygium syndrome; multiple pterygium syndrome, aslan type; popliteal pterygium syndrome, bartsocas-papas type 1

Patient organizations

Source: NIH GARD · Bartsocas-Papas syndrome 1GARD ID 4436 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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