Medical Monitoring & Multisystem Health in KdVS

Managing Koolen-de Vries Syndrome (KdVS) involves a “team approach” to health. Because the KANSL1 gene is active throughout the body, KdVS is a multisystem disorder, meaning it can affect different organs and body functions ^[1][2]. While no single child will have every complication, a proactive monitoring plan helps your medical team catch and manage issues early.

Protecting the Spine and Joints

Children with KdVS are at a higher risk for musculoskeletal issues, particularly scoliosis (an abnormal curvature of the spine) ^[3][1]. Because low muscle tone (hypotonia) can affect how the spine is supported, experts recommend a specific schedule for routine clinical screening (such as physical exams by a doctor) to limit unnecessary radiation exposure. X-rays are usually recommended only if the clinical exam indicates a potential curve or abnormality:

• At Diagnosis: To establish a baseline through a clinical exam ^[4].
• At Age 10: To monitor the spine during the pre-puberty growth spurt ^[4].
• At Age 18: To check the final alignment of the adult spine ^[4].

Neurological Health and Seizures

About half of individuals with KdVS develop epilepsy ^[5][6]. These seizures often start in early childhood, with a median age of about 3.5 years ^[5][6].

• Monitoring for Seizures: Doctors have a “low threshold” for ordering an EEG (a test that measures brain waves) if a child shows symptoms like staring spells, “zoning out,” or unusual repetitive movements ^[6].
• Developmental Regression: If a child stops making progress or loses skills they once had (a plateau or regression), an overnight EEG that captures sleep is highly recommended ^[7].
• Brain Structure: MRI scans sometimes reveal structural differences, such as a dysplastic corpus callosum (where the bridge between the two halves of the brain is shaped differently) ^[8].

Vision and Eye Health

Regular visits to a pediatric ophthalmologist are essential. Common eye issues in KdVS include:

• Ptosis: Droopy eyelids that can sometimes interfere with vision ^[9].
• Strabismus: Crossed or misaligned eyes ^[9].
• Hyperopia: Significant far-sightedness ^[9].

Heart and Kidney Screening

At the time of diagnosis, it is standard practice to perform baseline imaging to check for internal structural differences:

• Echocardiogram: A heart ultrasound to look for congenital heart defects ^[1][10].
• Renal Ultrasound: An ultrasound of the kidneys and bladder to check for genitourinary anomalies ^[1][11].

Endocrine and Growth Concerns

The endocrine system (which controls hormones) can also be involved in KdVS.

• Hypopituitarism: In some cases, the pituitary gland—the body’s “master gland”—does not produce enough hormones, which can affect growth and development ^[12].
• Weight Management: As children with KdVS enter adulthood, there is a known tendency toward becoming overweight or obese ^[13]. Establishing healthy nutrition and physical activity early on is an important part of long-term care ^[13].

Hearing

While ear or hearing problems are not considered a “core” feature of KdVS, a baseline audiology (hearing) test is often recommended for any child with developmental delays to ensure that hearing loss is not contributing to speech difficulties ^[1].

Anesthesia Precautions

Because children with KdVS may have low muscle tone, distinctive facial/airway features, or underlying cardiac anomalies, they often require a pre-anesthesia consultation before routine surgeries (such as getting ear tubes or dental work) ^[1].