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Cantú syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Cantú Syndrome

Cantú syndrome is an extremely rare genetic condition marked by excessive hair growth, distinctive coarse facial features, and congenital heart defects.

Overview

Cantú syndrome is a complex disorder characterized by hypertrichosis (excessive hair growth), characteristic facial abnormalities, cardiovascular defects, and skeletal variations. The symptoms and severity of the condition can vary widely from person to person.

Symptoms and Clinical Features

The physical manifestations of Cantú syndrome involve multiple body systems:

Hair and Facial Features

  • Hypertrichosis: Thick scalp hair extending onto the forehead and cheeks in front of the ears, alongside increased hair across the body, especially the back, arms, and legs.
  • Coarse facial appearance: Broad nasal bridge, skin folds covering the inner corners of the eyes (epicanthal folds), and a wide mouth with full lips.
  • Facial changes over time: Lengthening of the face, a more prominent chin, and deep-set eyes as individuals age.
  • An unusually large head size.

Cardiovascular Abnormalities

  • Cardiomegaly: An abnormally enlarged heart.
  • Patent ductus arteriosus (PDA): A failure of the blood vessel connecting the aorta and the pulmonary artery to close after birth.
  • Pericardial effusion: Abnormal fluid accumulation surrounding the heart.
  • Pulmonary hypertension: Abnormally high blood pressure in the vessels carrying blood from the heart to the lungs.

Skeletal, Neurological, and Other Features

  • Distinctive skeletal abnormalities and reduced bone density (osteopenia)
  • Large body size at birth (macrosomia)
  • Reduced subcutaneous fat beginning in childhood
  • Deep horizontal creases on the palms of the hands and soles of the feet
  • Weak muscle tone (hypotonia), leading to delayed motor milestones such as sitting, standing, and walking
  • Delayed speech development, with occasional mild intellectual disability or learning difficulties
  • Side-to-side curvature of the spine (scoliosis)
  • Tissue swelling (edema) and heightened susceptibility to respiratory infections

Causes

Cantú syndrome is caused by mutations in the ABCC9 gene. This gene encodes a subunit of a potassium channel that regulates the movement of potassium ions across cell membranes.

Mutations in ABCC9 alter the structural conformation of the channel, causing it to remain open when it should be closed. The exact mechanisms linking abnormal potassium channel function to excess hair growth, structural heart anomalies, and other clinical symptoms remain under study.

Inheritance

This condition follows an autosomal dominant inheritance pattern, requiring only a single copy of the altered ABCC9 gene in each cell to cause the disorder.

  • De novo mutations: Most cases occur sporadically in individuals with no prior family history of the disorder.
  • Inherited cases: In a small number of reported instances, individuals have inherited the mutated gene directly from an affected parent.

Frequency

Cantú syndrome is exceptionally rare. Only about three dozen affected individuals have been documented in medical literature.

Other Names

  • Cantu syndrome
  • Hypertrichosis-osteochondrodysplasia-cardiomegaly syndrome
  • Hypertrichotic osteochondrodysplasia

Frequently Asked Questions

Topical eflornithine, laser hair removal, or long‑term use of depilatory creams can lessen visible hair, but they do not affect the underlying genetic cause. Treatment is cosmetic and should be discussed with a dermatologist; it may improve self‑esteem but requires ongoing maintenance.
Sudden onset of rapid breathing, cyanosis, chest pain, or fainting may signal worsening pulmonary hypertension, a large pericardial effusion, or heart failure from cardiomegaly. Immediate evaluation in an emergency department for echocardiography and possible drainage of fluid is essential.
Most cases are caused by de novo (new) mutations in the ABCC9 or KCNJ8 genes, meaning parents are usually not carriers and the recurrence risk is low (<1%). However, rare autosomal‑dominant inherited cases have been reported; if a parent is found to carry the mutation, each pregnancy carries a 50% chance of transmission. Genetic counseling and targeted testing are recommended for family planning.===
Look for a combination of macrosomia (large birth weight), coarse facial features such as a broad nasal bridge and epicanthal folds, excessive hair on the scalp extending onto the forehead and cheeks, and any cardiac murmur that might indicate a patent ductus arteriosus or cardiomegaly. When these signs appear together, especially with deep horizontal palmar creases, a genetics referral and echocardiogram are warranted.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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