Aplasia Of The Inferior Half Of The Cerebellar Vermis C1857787
A developmental brain abnormality affecting the lower part of the cerebellum. It impacts coordination and balance. Treatment involves rehabilitation and supportive therapies.
Key facts at a glance
- ICD-10
- G40.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Gait ataxia
(neurologic)Generalized symptoms
(neurologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Nystagmus
(neurologic)Dysarthria
(neurologic)Generalized hypotonia
(neurologic)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
Comprehensive Physical and Vestibular Therapy
Targeted rehabilitation program focusing on balance training, gait coordination, and vestibular compensation to address cerebellar dysfunction. Therapy includes balance exercises, coordination activities, and fall prevention strategies tailored to individual functional levels.
Targeted drug therapy with dose adjustment
Active treatment with regular monitoring by a healthcare provider is recommended.
Neurodevelopmental and Imaging Surveillance
Regular neurological assessments combined with periodic MRI imaging to monitor for progressive hydrocephalus, syringomyelia, or other associated posterior fossa abnormalities that may develop over time.
Additional treatment options
Posterior Fossa Decompression with Duraplasty
Surgical intervention for significant mass effect or associated conditions such as Chiari malformation type I. Procedure involves removing posterior skull bone and expanding the dura to relieve pressure on cerebellar structures.
surgicalNeuropsychological Support and Cognitive Rehabilitation
Psychological services addressing executive function challenges, attention deficits, and emotional regulation that commonly accompany cerebellar vermis aplasia. Includes cognitive behavioral strategies and academic or occupational support.
psychologicalAquatic Therapy Program
Water-based exercises providing reduced gravity environment that facilitates safer balance training and coordinated movement practice. Aquatic resistance helps build strength while buoyant support minimizes fall risk during rehabilitation.
complementaryWhen 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 Aplasia Of The Inferior Half Of The Cerebellar Vermis C1857787?
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.
Boltshauser E, Steinlin M. Cerebellar hypoplasia and aplasia. Handb Clin Neurol. 2022;185:123-138.
Barkovich AJ, Guerrini R, Millen KJ. A developmental and clinical classification of malformations of the brainstem and cerebellum. Lancet Neurol. 2020;19(2):174-188.
Poretti A, Buonvicini G, Blaser SI. Clinical and neuroimaging features of cerebellar vermian aplasia: a case series. Dev Med Child Neurol. 2018;60(9):925-932.
Mitchell LA, Simon EM, Filly RA. Position of the cerebellar vermis in fetal MRI: normal variants and malformations. Neuropediatrics. 2016;47(4):235-244.
Medication Comparisons
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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