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Malan overgrowth syndrome

Synonyms
MALAN SYNDROME; Sotos syndrome 2
Modes of inheritance
Autosomal dominant inheritance (Orphanet)
Unknown inheritance (Orphanet)

Summary

Excerpted from the GeneReview: NFIX-Related Malan Syndrome
NFIX-related Malan syndrome (MALNS) is characterized by prenatal and postnatal overgrowth, macrocephaly, advanced bone age and/or skeletal anomalies (scoliosis, pes planus), slender body habitus, developmental delay / intellectual disability (typically in the moderate-to-severe range), behavioral problems (including a specific anxious profile and attention-deficit/hyperactivity disorder [ADHD]), and ocular findings (most commonly strabismus, refractive errors, and blue sclerae). Affected individuals typically have distinctive facial features, including a long and triangular face, high anterior hair line with prominent forehead, depressed nasal bridge, deep-set eyes, downslanted palpebral fissures, short nose with anteverted nares and upturned tip, long philtrum, small mouth that is often held open, thin vermilion of the upper lip, an everted lower lip, and a prominent chin. Other findings may include autonomic signs (episodic ataxia with dizziness and nausea and/or postural fainting), seizures or EEG abnormalities, hypotonia, dental anomalies, long bone fractures, and (rarely) congenital heart defects. Four individuals with aortic root dilatation have been reported, with one adult individual experiencing progressive aortic dilation and dissection at age 38 years. Additionally, one individual with rib osteosarcoma and another with Wilms tumor have been reported (an overall prevalence of malignancy of about 2%). Therefore, MALNS appears to be in the same low risk group as Sotos syndrome and Weaver syndrome with respect to a low likelihood of developing cancer.
Full text of GeneReview (by section):
Summary
Diagnosis
Clinical Characteristics
Genetically Related (Allelic) Disorders
Differential Diagnosis
Management
Genetic Counseling
Resources
Molecular Genetics
Chapter Notes
References
Authors:
Manuela Priolo
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Available tests

29 tests are in the database for this condition.

Check Related conditions for additional relevant tests.

Clinical tests (29 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: CTF, MALNS, MRSHSS, NF-I/X, NF1-X, NF1A, SOTOS2, NFIX
    Summary: nuclear factor I X

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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