Distal Monosomy 9p Syndrome C0265425
Also known as 9p minus syndrome, this involves deletion of genetic material from chromosome 9. It causes distinctive facial features and developmental delays. Care addresses specific symptoms with multidisciplinary support.
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.
Warning signs - seek immediate care
Congenital heart defect
Seizures
Developmental delay
(neurological)Generalized symptoms
(congenital)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Trigonocephaly
(craniofacial)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
Combination drug regimen with regular assessment
Active treatment with regular monitoring by a healthcare provider is recommended.
Gonadal dysfunction surveillance
Regular endocrine evaluation for gonadal dysgenesis, hypogonadism, and associated hormonal deficiencies commonly seen in distal monosomy 9p syndrome, including hormone level testing.
Hormone replacement therapy
Endocrine management with appropriate hormone replacement for diagnosed hypogonadism, thyroid dysfunction, or other endocrine deficiencies associated with the chromosomal deletion.
Additional treatment options
Skeletal and joint abnormality management
Physical therapy interventions for joint contractures, skeletal abnormalities, and motor delays including range of motion exercises, strengthening, and positioning support.
physical_therapyNeuropsychological support services
Comprehensive neuropsychological care addressing intellectual disability, executive function deficits, and emotional regulation difficulties associated with 9p monosomy.
psychologicalSkeletal malformation correction
Surgical intervention for significant skeletal abnormalities including limb malformations, spinal deformities, or joint contractures that impair function or cause pain.
surgicalWhen 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 Distal Monosomy 9p Syndrome C0265425?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalMedication Comparisons
Compare medications used to treat Distal Monosomy 9p Syndrome C0265425. 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.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy