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Noonan syndrome with multiple lentigines

Definition

Noonan syndrome with multiple lentigines (NSML) is a very rare inherited disorder. People with this condition have problems with the skin, head and face, inner ear, and heart. The genitals may also be affected.

Noonan syndrome was formerly known as LEOPARD syndrome.

Alternative Names

Multiple lentigines syndrome; LEOPARD syndrome; NSML

Causes

NSLM is inherited as an autosomal dominant trait. This means the person only needs the abnormal gene from one parent in order to inherit the disease.

Symptoms

The former name of NSML of LEOPARD stands for the different problems (signs and symptoms) of this disorder:

  • Lentigines – large number of brown or black freckle-like skin markings that mainly affect the neck and upper chest but can appear all over the body
  • Electrocardiograph conduction abnormalities – problems with the electrical and pumping functions of the heart
  • Ocular hypertelorism – eyes that are spaced wide apart
  • Pulmonary valve stenosis– narrowing of the pulmonary heart valve, resulting in less blood flow to the lungs and causing shortness of breath
  • Abnormalities of the genitals – such as undescended testicles
  • Retardation of growth (delayed growth) – including bone growth problems of the chest and spine
  • Deafness – hearing loss may vary between mild and severe

NSML is similar to Noonan syndrome. However, the main symptom that tells apart the two conditions is that people with NSML have lentigines.

Exams and Tests

The health care provider will perform a physical exam and listen to the heart with a stethoscope. 

Tests that may be done include:

  • ECG and echocardiogram to check the heart
  • Hearing test
  • CT scan of the brain
  • Skull x-ray
  • EEG to check the brain's function
  • Blood tests to check certain hormone levels
  • Removing a small amount of skin for examination (skin biopsy)

Treatment

Symptoms are treated as appropriate. A hearing aid may be needed. Hormone treatment may be necessary at the expected time of puberty to cause the normal changes to occur.

Laser, cryosurgery (freezing), or bleaching creams may help lighten some of the brown spots on the skin.

Support Groups

These resources can provide more information on LEOPARD syndrome:

Possible Complications

Complications vary and include:

  • Deafness
  • Delayed puberty
  • Heart problems
  • Infertility

When to Contact a Medical Professional

Call your provider if there are symptoms of this disorder.

Call for an appointment with your provider if you have a family history of this disorder and plan to have children.

Prevention

Genetic counseling is recommended for people with a family history of NSLM who want to have children.

References

James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM. Melanocytic nevi and neoplasms. In: James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM, eds. Andrews' Diseases of the Skin. 13th ed. Philadelphia, PA: Elsevier; 2020:chap 30.

Paller AS, Mancini AJ. Disorders of pigmentation. In: Paller AS, Mancini AJ, eds. Hurwitz Clinical Pediatric Dermatology. 5th ed. Philadelphia, PA: Elsevier; 2016:chap 11.



Review Date: 4/16/2019
Reviewed By: Michael Lehrer, MD, Clinical Associate Professor, Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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