Abstract
Neurofibromatosis (NF) and tuberous sclerosis complex (TSC) are the two most common
neurocutaneous disorders, both transmitted as autosomal dominant or, in the case of
NF, also as a mosaic condition. The causative genetic mutations in these neurocutaneous
disorders can lead to benign skin changes or uninhibited growth and proliferation
in multiple organ systems due to the loss of tumor suppression in mitogen-activated
protein kinase and mammalian target of rapamycin signaling pathways. Common clinical
features in NF include pigmented lesions, known as café au lait patches, neurofibromas,
intertriginous freckles (Crowe's sign), and benign fibrous growths, such as hamartomas
in multiple organ systems. Common clinical features in TSC include hypopigmented macules,
known as ash leaf spots, in addition to neurologic sequelae, such as autism, seizures,
and developmental delays. Advances in genetic sequencing technologies have allowed
an exponential expansion in the understanding of NF and TSC.
Consensus criteria have been established for both diagnoses that can be confirmed
in most cases through gene testing. Once diagnosed, the clinical and diagnostic value
of disease-specific surveillance include early identification of benign and malignant
tumors. Genetic counseling is important for informed reproductive decision-making
for patients and at-risk family members. The improvement in understanding of pathways
of pathogenic disease development and oncogenesis in both conditions have produced
a new series of therapeutic options that can be used to control seizures and tumor
growth. Tremendous advances in life expectancy and quality of life are now a reality
due to early introduction of seizure control and novel medications. While we lack
cures, early institution of interventions, such as seizure control in tuberous sclerosis,
appears to be disease-modifying and holds immense promise to offer patients better
lives.
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Published online: March 03, 2022
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