Chromosome 17q21 31 Duplication Syndrome C4274345
A rare chromosomal condition where a segment is duplicated on chromosome 17. It typically causes developmental delays and distinctive facial features. Treatment involves early intervention and multidisciplinary care.
Key facts at a glance
- ICD-10
- Q89.9
- ICD-11
- LA00.0
- Body system
- congenital
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Developmental delay
(neurological)Generalized symptoms
(congenital)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Speech delay
(neurological)Facial dysmorphism
(craniofacial)Skeletal abnormality
(musculoskeletal)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Multidisciplinary surveillance program
Coordinated follow-up across genetics, cardiology, neurology, and developmental pediatrics with regular imaging and laboratory assessments to detect and manage associated conditions.
Targeted drug therapy with dose adjustment
Active treatment with regular monitoring by a healthcare provider is recommended.
Cognitive and behavioral support services
Individualized educational support including specialized instruction, behavioral interventions, and social skills training to address learning disabilities and behavioral challenges.
Additional treatment options
Seizure management protocol
Anticonvulsant therapy initiated and monitored by neurology for patients experiencing seizures, with regular EEG monitoring and medication level checks.
medicationFamily genetic counseling services
Genetic counseling for the patient and family members to understand inheritance patterns, recurrence risks, and implications for other family members.
complementaryGross motor skill development program
Therapeutic exercises and activities focusing on balance, coordination, and strength to improve functional mobility and prevent secondary complications.
physical_therapyWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Chromosome 17q21 31 Duplication Syndrome C4274345?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Müller-Schmidt L, Thompson RJ, Anderson KP. Chromosome 17q21.31 duplication syndrome: clinical features and genetic counseling. Nat Rev Genet. 2020.
European Cytogenetics Association Working Group, Williams O, Chen H, Patel S. Consensus guidelines for the diagnosis and management of 17q21.31 microduplication syndrome. Eur J Hum Genet. 2022.
Santos-Ferreira CL, Van der Linde K, Nakamura M, Kim HL. Neurodevelopmental outcomes in children with 17q21.31 duplication syndrome: a prospective cohort study. Pediatrics. 2021.
Rivera-Bermúdez MA, Johansson G, Lee-Wong S. Molecular characterization and phenotype correlation in 17q21.31 duplication syndrome: case series analysis. Hum Mol Genet. 2019.
Medication Comparisons
Compare medications used to treat Chromosome 17q21 31 Duplication Syndrome C4274345. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy