Multiple lentigines syndrome; LEOPARD syndrome; NSML
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.
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.
The former name of NSML of LEOPARD stands for the different problems (signs and symptoms) of this disorder:
NSML is similar to Noonan syndrome. However, the main symptom that tells apart the two conditions is that people with NSML have lentigines.
The health care provider will perform a physical exam and listen to the heart with a stethoscope.
Tests that may be done include:
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.
More information and support for people with LEOPARD syndrome and their families can be found at:
Complications vary and include:
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.
Genetic counseling is recommended for people with a family history of NSLM who want to have children.
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: Clinical Dermatology. 13th ed. Philadelphia, PA: Elsevier; 2020:chap 30.
Paller AS, Mancini AJ. Disorders of pigmentation. In: Paller AS, Mancini AJ, eds. Paller and Mancini – Hurwitz Clinical Pediatric Dermatology. 6th ed. Philadelphia, PA: Elsevier; 2022:chap 11.BACK TO TOP
Review Date: 4/14/2021
Reviewed By: Elika Hoss, MD, Senior Associate Consultant, Mayo Clinic, Scottsdale, AZ. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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