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PubMed This is a summary of 33 peer-reviewed journal articles Updated
Neonatology

Understanding Fryns Syndrome: A Guide for Parents

At a Glance

Fryns syndrome is an extremely rare and severe genetic condition characterized by a congenital diaphragmatic hernia, facial differences, and limb anomalies. The prognosis is generally very poor due to underdeveloped lungs, requiring families to navigate complex care decisions with their medical team.

Receiving a diagnosis or a strong suspicion of Fryns syndrome is an overwhelming and heart-wrenching experience for any parent. This condition is extremely rare, with only a few hundred cases documented in medical history [1]. Because it is so uncommon, many healthcare providers may have never seen a case in person, which can add to the feeling of isolation and fear.

Fryns syndrome is a genetic condition that affects the development of multiple systems in the body. It is often described as a lethal syndrome, meaning it is frequently life-threatening shortly after birth [1][2]. While every child is unique, doctors use a specific set of physical findings to make this diagnosis.

The Three Cardinal Signs

To diagnose Fryns syndrome, doctors look for a specific “triad” of features. These are often referred to as cardinal signs:

  1. Congenital Diaphragmatic Hernia (CDH): This is a hole in the diaphragm, the muscle that separates the chest from the abdomen [2][1]. This hole allows abdominal organs (like the stomach or liver) to move into the chest cavity, leaving little room for the lungs to grow.
  2. Facial Differences: Children with Fryns syndrome often have a distinct facial appearance, which may include a broad nasal bridge, a “coarse” facial look, or a small jaw (micrognathia) [1][3].
  3. Distal Limb Anomalies: This refers to differences at the very ends of the fingers and toes. These may appear underdeveloped (hypoplastic), or the nails may be very small or missing [2][1].

Understanding the Prognosis

It is important to have an honest discussion about the outlook for Fryns syndrome. The prognosis is generally very poor, and many infants do not survive the neonatal period (the first 28 days of life) [1][2].

The primary cause of mortality is pulmonary hypoplasia, which means the lungs are severely underdeveloped [2][4]. Because the abdominal organs moved into the chest during pregnancy, the lungs did not have the space they needed to form properly. Even with the most advanced medical support, the lungs may not be able to provide enough oxygen for the baby to survive [1][4]. For babies with syndromic CDH (CDH that is part of a larger syndrome like Fryns), the survival rate is significantly lower than for those with isolated CDH, with some studies estimating survival as low as 17% [5][6].

Navigating This Guide

Because Fryns syndrome is complex and the outcomes are difficult, care involves a multidisciplinary team and agonizing choices. We have created specific pages to help you understand your child’s condition and navigate the days ahead:

01

Genetics & Biology: The PIGN Gene & Inheritance

Understand the genetics of Fryns syndrome, including the role of the PIGN gene, GPI anchors, and how autosomal recessive inheritance affects your family.

02

Prenatal Diagnosis: Deciphering Ultrasounds and Genetic Reports

Learn how to read your prenatal ultrasound and genetic reports for Fryns syndrome. Understand terms like CDH, pulmonary hypoplasia, and PIGN gene testing.

03

Treatment Strategy & Care Decisions: At Birth and Beyond

Learn about treatment options for infants born with Fryns syndrome. Understand delivery room expectations, maximal intervention, and palliative care choices.

04

What to Expect: Survival, Outcomes, & Rare Survivorship

Learn about Fryns syndrome survival rates, long-term outcomes, and rare survivorship. Understand the MCAHS1 spectrum and how to build a lifelong care team.

While the medical facts are stark, your team is there to help you navigate these choices with compassion for your child and your family.

Common questions in this guide

What are the main signs of Fryns syndrome?
Doctors look for three cardinal signs to diagnose Fryns syndrome. These include a congenital diaphragmatic hernia (a hole in the diaphragm), specific facial differences like a small jaw or broad nasal bridge, and underdeveloped fingers or toes.
What is the life expectancy for a baby with Fryns syndrome?
The prognosis for Fryns syndrome is generally very poor, and it is often life-threatening shortly after birth. Many infants do not survive the first 28 days of life, primarily due to severe underdevelopment of the lungs.
Why do babies with Fryns syndrome have underdeveloped lungs?
Babies with Fryns syndrome often have a congenital diaphragmatic hernia, which allows abdominal organs to move into the chest cavity during pregnancy. This takes up crucial space, preventing the lungs from growing normally and leading to a condition called pulmonary hypoplasia.
What are the care options for a baby born with Fryns syndrome?
Care options require a multidisciplinary medical team and involve very difficult choices. Parents can discuss pursuing maximal intensive medical intervention immediately after birth or working with a pediatric palliative care team to prioritize the baby's comfort and quality of life.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Does my child meet all three 'cardinal' clinical criteria for Fryns syndrome?
  2. 2.What is the severity of the pulmonary hypoplasia (underdeveloped lungs) in this case?
  3. 3.Can you put us in touch with a pediatric palliative care team to discuss our options and goals for care?
  4. 4.If we pursue intensive intervention, what specific specialized care would my child need immediately after birth?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (6)
  1. 1

    When Fryn met Edward: Two rare syndromes in a single patient.

    Nandan N, Raman VS, Dey S, Dwivedi D

    Medical journal, Armed Forces India 2022; (78(1)):109-112 doi:10.1016/j.mjafi.2019.10.005.

    PMID: 35035054
  2. 2

    Craniorachischisis Totalis with Congenital Diaphragmatic Hernia-A Rare Presentation of Fryns Syndrome.

    Singh A, Pilli GS, Bannur H

    Fetal and pediatric pathology 2016; (35(3)):192-8 doi:10.3109/15513815.2016.1155681.

    PMID: 27064748
  3. 3

    Challenging Anaesthesia Management of a Patient with Fryns Syndrome: A Case Report.

    Kaya C, Kendigelen P, Yılmaz KM, et al.

    Turkish journal of anaesthesiology and reanimation 2023; (51(3)):275-277 doi:10.4274/TJAR.2022.221038.

    PMID: 37455543
  4. 4

    Management advances for congenital diaphragmatic hernia: integrating prenatal and postnatal perspectives.

    Baschat AA, Desiraju S, Bernier ML, et al.

    Translational pediatrics 2024; (13(4)):643-662 doi:10.21037/tp-23-602.

    PMID: 38715680
  5. 5

    Congenital diaphragmatic hernia: does gestational age at diagnosis matter when evaluating morbidity and mortality?

    Bouchghoul H, Senat MV, Storme L, et al.

    American journal of obstetrics and gynecology 2015; (213(4)):535.e1-7.

    PMID: 26070705
  6. 6

    Genetics of diaphragmatic hernia.

    Schreiner Y, Schaible T, Rafat N

    European journal of human genetics : EJHG 2021; (29(12)):1729-1733 doi:10.1038/s41431-021-00972-0.

    PMID: 34621023

This page provides educational information about Fryns syndrome for parents and caregivers. It does not replace professional medical advice, prognosis, or treatment plans from your pediatric or genetic care team.

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