Short answer · Medically reviewed summary · Last updated: 2026-05-08
Trisomy 13 Syndrome, also known as Patau Syndrome, is a chromosomal condition characterized by the presence of an extra copy of chromosome 13 in some or all of the body's cells. The symptoms of Trisomy 13 Syndrome are typically multi-systemic, often involving severe intellectual disability, structural heart defects, and distinct physical abnormalities such as cleft lip or palate and polydactyly. What are the most common symptoms of Trisomy 13 Syndrome? The clinical presentation of Patau Syndrome is highly variable, but it frequently impacts nearly every organ system.
Which are the symptoms of Trisomy 13 Syndrome / Patau Syndrome?
Symptoms of Trisomy 13 Syndrome / Patau Syndrome reported by real patients, from the most common to the most limiting, plus a medically reviewed summary with sources.
Trisomy 13 Syndrome, also known as Patau Syndrome, is a chromosomal condition characterized by the presence of an extra copy of chromosome 13 in some or all of the body's cells. The symptoms of Trisomy 13 Syndrome are typically multi-systemic, often involving severe intellectual disability, structural heart defects, and distinct physical abnormalities such as cleft lip or palate and polydactyly.
What are the most common symptoms of Trisomy 13 Syndrome?
The clinical presentation of Patau Syndrome is highly variable, but it frequently impacts nearly every organ system. Common physical and developmental symptoms include:
- Severe intellectual disability and developmental delays.
- Structural heart defects (e.g., ventricular septal defects), present in approximately 80% of cases.
- Craniofacial abnormalities, including microcephaly (small head), cleft lip, and cleft palate.
- Polydactyly (extra fingers or toes) and rocker-bottom feet.
- Neurological issues, such as holoprosencephaly, where the forebrain fails to divide properly.
- Ocular defects, including microphthalmia (small eyes) or coloboma.
How does the severity of Patau Syndrome vary?
The severity of Trisomy 13 Syndrome often depends on the specific type of chromosomal error. In full trisomy, where every cell has an extra chromosome 13, symptoms are typically more severe. In cases of mosaic Patau Syndrome, where only some cells carry the extra chromosome, the physical and cognitive manifestations may be milder, though clinical outcomes remain unpredictable.
When should families seek immediate medical attention?
Given the high frequency of cardiac and respiratory complications in Trisomy 13 Syndrome, families must seek immediate care if an infant exhibits cyanosis (bluish skin tint), difficulty breathing, or persistent feeding intolerance. These are common early warning signs of underlying structural heart or airway issues that require urgent pediatric cardiology or neonatology intervention.
How do symptoms evolve over time?
In children with Patau Syndrome who survive the initial neonatal period, symptoms often shift from acute organ system management to long-term neurodevelopmental support. While many infants face significant life-limiting challenges, ongoing care often involves managing seizures, developmental therapy for motor and cognitive delays, and monitoring for persistent cardiac or renal health issues.
Next steps
- Consult with a clinical geneticist to confirm the diagnosis and understand the specific chromosomal profile.
- Connect with the DiseaseMaps.org community to share experiences with others managing this diagnosis.
- Establish a multidisciplinary care team, including a pediatric cardiologist, neurologist, and feeding specialist.
Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the guidance of a qualified healthcare provider.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Trisomy 13
- Orphanet: Patau Syndrome (ORPHA:705)
- OMIM (Online Mendelian Inheritance in Man): Chromosome 13, Trisomy 13
- SOFT (Support Organization for Trisomy 18, 13, and Related Disorders)
