Nevo syndrome

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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Nevo syndrome
Synonyms
Pronounce
Specialty	Medical genetics
Symptoms	Overgrowth, joint laxity, hypotonia, developmental delay
Complications	N/A
Onset	Infancy
Duration
Types
Causes	Mutations in the FBN1 gene
Risks
Diagnosis	Genetic testing, clinical evaluation
Differential diagnosis	Marfan syndrome, Ehlers-Danlos syndrome
Prevention
Treatment	Supportive care, physical therapy
Medication
Prognosis
Frequency	Rare
Deaths

Introduction

Nevo syndrome is a rare genetic disorder characterized by overgrowth, developmental delay, and distinctive facial features. It is inherited in an autosomal recessive pattern, meaning that two copies of the mutated gene, one from each parent, are required for an individual to be affected by the disorder.

Genetics

Nevo syndrome is caused by mutations in a specific gene, although the exact gene responsible has not been definitively identified. The disorder follows an autosomal recessive inheritance pattern, which is depicted in the diagram to the right. In this pattern, both parents of an affected individual are typically carriers of one copy of the mutated gene but do not show symptoms of the disorder themselves.

Clinical Features

Individuals with Nevo syndrome often present with a range of clinical features, including:

• Overgrowth: Excessive growth in height and weight during infancy and early childhood.
• Developmental delay: Delays in reaching developmental milestones such as sitting, walking, and talking.
• Distinctive facial features: These may include a prominent forehead, wide-set eyes, and a broad nasal bridge.
• Hypotonia: Reduced muscle tone, which can affect movement and posture.

Diagnosis

The diagnosis of Nevo syndrome is primarily based on clinical evaluation and the presence of characteristic features. Genetic testing may be used to confirm the diagnosis by identifying mutations in the gene associated with the disorder.

Management

There is currently no cure for Nevo syndrome, and treatment is focused on managing symptoms and supporting development. This may include:

• Physical therapy to improve muscle tone and coordination.
• Speech therapy to assist with communication skills.
• Occupational therapy to help with daily living activities.

Prognosis

The prognosis for individuals with Nevo syndrome varies depending on the severity of symptoms and the presence of any associated complications. Early intervention and supportive therapies can improve quality of life and developmental outcomes.

See also

• Genetic disorder
• Autosomal recessive inheritance
• Developmental delay