CLOVES syndrome

Overview

CLOVES syndrome is a rare congenital disorder characterized by a combination of vascular anomalies, overgrowth, and other distinctive features. The acronym CLOVES stands for Congenital, Lipomatous, Overgrowth, Vascular malformations, Epidermal nevi, and Skeletal/spinal anomalies. This condition is caused by mutations in the PIK3CA gene, which plays a crucial role in cell growth and division.

Etiology

CLOVES syndrome is caused by somatic mutations in the PIK3CA gene. These mutations lead to the activation of the PI3K-AKT-mTOR pathway, which results in abnormal cell growth and proliferation. The PIK3CA gene is part of the phosphoinositide 3-kinase (PI3K) family, which is involved in various cellular functions, including metabolism, growth, and survival.

Diagram of the PI3K pathway, which is implicated in CLOVES syndrome.

Clinical Features

Patients with CLOVES syndrome present with a wide range of clinical features, which can vary significantly in severity. Common manifestations include:

• Vascular malformations: These can include capillary, venous, and lymphatic malformations.
• Lipomatous overgrowth: Abnormal growth of fatty tissue, often asymmetric.
• Epidermal nevi: Skin lesions that are present at birth.
• Skeletal anomalies: These may include scoliosis, limb length discrepancies, and other bone abnormalities.
• Spinal anomalies: Such as tethered cord syndrome.

Diagnosis

The diagnosis of CLOVES syndrome is primarily clinical, based on the presence of characteristic features. Genetic testing can confirm the diagnosis by identifying mutations in the PIK3CA gene. Imaging studies, such as MRI and CT scans, are often used to assess the extent of vascular malformations and overgrowth.

Management

Management of CLOVES syndrome is multidisciplinary and tailored to the individual patient's needs. It may include:

• Surgical intervention to address overgrowth and vascular malformations.
• Sclerotherapy for vascular anomalies.
• Orthopedic management for skeletal deformities.
• Regular monitoring and supportive care.

Prognosis

The prognosis for individuals with CLOVES syndrome varies depending on the severity of the condition and the presence of complications. Early diagnosis and appropriate management can improve outcomes and quality of life.

Related pages

• Vascular malformation
• PIK3CA
• Overgrowth syndromes