phakomatosis phakomatosis phakomatoses, also known neurocutaneous syndromes, are a group of multisystemic diseases that most prominently affect structures primarily derived from the ectoderm such as the central nervous system, skin and eyes. the majority of phakomatoses are single-gene disorders that may be inherited in an autosomal dominant, autosomal recessive or x-linked pattern. presentations may vary dramatically between patients with the same particular syndrome due to mosaicism, variable expressivity, and penetrance. phakomatosesother namesneurocutaneous syndromesspecialtymedicine, neurology, neurosurgery, medical genetics, dermatology, psychology, psychiatry and moresymptomsdermal, ocular and cns benign and malignant tumors. various additional potential complications.complicationsnumerous potential complications including cosmetic, intellectual disability, epilepsy, organ failure and more.usual onsetchildhood (most commonly)durationlifelongcausesgenetic causestreatmenthighly variable. many require lifelong surveillance and various treatments depending on the particular syndrome and presentation. many phakomatoses are caused by mutations which alter functioning of the ras–mitogen-activated protein kinase (mapk) pathway that regulates cellular growth, differentiation, proliferation and death. this results in a tendency for individuals with these mutations to develop various types of benign or malignant tumors depending on the particular mutation. the presence of these tumors may result in functional and/or cosmetic problems depending on their type and location. history the term phakomatosis originated in 1923, when the dutch ophthalmologist van der hoeve used the term phakoma to refer to a "mother spot" or birthmark, a physical characteristic common to patients with tuberous sclerosis and neurofibromatosis that he examined. the term phakomatoses was derived from phakos, the greek term for 'birthmark'. he originally used the phrase to describe two diseases: neurofibromatosis and tuberous sclerosis. this term later became imprecise when van der hoeve also used it to include those with sturge-weber syndrome as they do not have similar lesions on the skin. in addition, the term phakomatosis makes no reference to the central nervous system involvement. the term neurocutaneous syndrome was subsequently defined by the russian-american neurologist paul ivan yakovlev and psychiatrist riley h. guthrie and it is currently more commonly used. the first clinical description was made in “monstrorum historia” by an italian physician and naturalist named ulisse aldrovandi who described a patient with probable neurofibromatosis type i in 1592. he described a short man with a large tumor which was likely a plexiform neurofibroma. however, there are artistic or descriptive representations which have been speculated to depict individuals with phakomatoses as far back as the hellenistic period and ancient egypt. over time, the number of neurocutaneous syndromes have increased and there are several dozen that have been characterized. types there are a large number of neurocutaneous syndromes that exceed the scope of this article. therefore, characteristics of a few of the more common types are summarized. neurofibromatosis type i (von recklinghausen disease) neurofibroma of the skin. patient with recklinghausen's disease. klaus d. peter, gummersbach, germany diagnostic criteria of neurofibromatosis type i, requiring at least 2 of the mentioned items. neurofibromatosis type 1 is the most common phakomatosis and it affects approximately 1 in 2500-3000 live births. it is a genetic disorder due to a germline mutation in the nf1 gene. this gene encodes a protein called neurofibromin that is involved in controlling cellular growth. malfunction of the gene results in multisystem manifestations involving the skin, central nervous system, peripheral nervous system, eyes and musculoskeletal system. the condition is inherited in an autosomal dominant manner. however, approximately one-half of patients with this condition have no family history and the mutation occurs spontaneously. in most instances, neurofibromatosis type 1 can be diagnosed clinically according to consensus criteria and genetic testing is only used in atypical presentations or for family planning decisions. café au lait spots are one of the most characteristic features of neurofibromatosis type 1. they are hyperpigmented lesions of the skin that increase in number and size during the first years of life. they are present in almost all patients but do not have malignant potential. freckling in the axillary and inguinal regions are another common presenting feature seen in as many as 90% of patients during childhood. lisch nodules (benign hamartomas of the iris) are seen in almost all patients but they do not cause any visual or ocular impairment. neurofibromas are benign nerve sheath tumors that occur in peripheral nerves. these typically develop during the teenage years. neurofibromas do not become malignant but can cause cosmetic concerns as well as local pruritus. when present in the spine they can affect nerve roots and result in both motor and sensory defects. surgery may be required in some cases. on the contrary, plexiform neurofibromas arise from multiple nerve fascicles and malignant transformation occurs in approximately 10% of cases. they may result in significant morbidity as they may cause organ compression, vascular occlusions, bone destruction, pain and cosmetic issues. plexiform neurofibromas are seen in 30-50% of patients. optic pathway gliomas are seen in 15-20% of patients with neurofibromatosis type 1. they most often arise during childhood. they often do not cause additional morbidity but may in up to one-half of patients. neurocognitive impairment, attention-deficit hyperactivity disorder, autism spectrum disorder and behavioral disorders are also commonly seen in patients with neurofibromatosis type 1. epilepsy is seen in 4-7% of patients. musculoskeletal system manifestations can develop in patients with neurofibromatosis type 1. common findings include sphenoid wing dysplasia, osteopenia, osteoporosis, anterior chest wall deformities as well as scoliosis. patients are at a much greater risk for fractures than the general population. vascular abnormalities are also frequently encountered in patients with neurofibromatosis type 1. these may include renal artery stenosis, pulmonary artery stenosis, cerebral artery stenosis and aneurysms. complications may include myocardial infarction and stroke. relative to the general population the risk for certain types of cancer is increased significantly. for instance, the risk for brain tumors and breast cancer is increased by 5 times. neurofibromatosis type ii figure of various morbidities associated with neurofibromatosis type ii. neurofibromatosis type 2 is an autosomal dominant condition that affects approximately 1 in 35,000-40,000 people. it is caused by mutations in the nf2 gene on chromosome 22 which has a high penetrance though most patients do not present with symptoms until adulthood. approximately half of patients have de novo mutations and as many as 59.7% are mosaic. patients who present in childhood tend to have a more severe phenotype. bilateral vestibular schwannomas are the most characteristic finding and in the vast majority of cases are benign. however, they are responsible for significant morbidity and are responsible for the most common presenting symptom of hearing loss in adults. they can also less commonly present with dizziness or balance impairment. it is estimated that schwannomas occur in over 90% of patients. meningiomas are the second most common tumor in nf2. approximately half of patients have an intracranial meningioma and extramedullary spinal meningiomas occur in one-fifth of patients. relative to the general population, meningiomas in nf2 tend to occur at a younger age, are more likely to be multiple and are associated with increased mortality. spinal cord ependymomas occur in 20-50% of patients but they are asymptomatic in the majority of cases. in cases that they are symptomatic the specific presentation will depend upon where they are located. potential symptoms include back pain, weakness and sensory changes. peripheral neuropathy eventually occurs in most patients with nf2. in some cases, a mononeuropathy affecting the facial nerve can occur as the first presenting symptom of nf2. other potential manifestations include focal amyotrophy, mononeuropathy multiplex or a severe generalized polyneuropathy in 3-5% of patients. ophthalmologic manifestations are also common with 60-80% of patients developing cataracts. optic nerve meningiomas and retinal hamartomas can result in vision loss. approximately, 70% of patients will have cutaneous manifestations but only 10% have more than 10 lesions. the majority of skin lesions are schwannomas but neurofibromas can also occur. tuberous sclerosis (bourneville syndrome) a case of tuberous sclerosis showing facial angiofibromas in characteristic butterfly pattern. herbert l. fred, md and hendrik a. van dijktuberous sclerosis complex (tsc) is a multisystemic disorder due to autosomal dominant mutations in either tsc1 or tsc2 which results in the impaired inhibition of the mechanistic target of rapamycin (mtor) signaling pathway. this leads to impaired regulation of cellular proliferation, survival, homeostasis, migration and other critical functions. the most typically affected organs include the brain, skin, kidney, heart and lung. the incidence of tsc is approximately 1 in 6,000 live births. similar to other neurocutaneous disorders there is variable penetrance and expressivity. tsc1 mutations tend to have a less severe phenotype and are more likely to be familial. a major development in the treatment of this condition occurred in 2010s when the fda approved mtor inhibitors for the treatment of several manifestations of tsc. epilepsy is among the most common manifestations of tsc and it occurs 80-90% of patients. it usually presents during the first few years of life and is medically refractory in two-thirds of patients. approximately, one-third of patients have infantile spasms. there are several types of brain lesions that can be found in tsc including subependymal nodules (sens), cortical tubers and subependymal giant cell astrocytomas (segas). sens and cortical tubers occur in approximately 80% and 90% of patients, respectively. segas occur in 10-15% of patients and are a major potential cause of morbidity and potentially mortality. they tend to present during the first 20 years of life. tsc-associated neuropsychiatric disorder (tand) refers to the behavioral, intellectual and psychiatric manifestations of tsc including autism spectrum disorder, attention deficit hyperactivity disorder, intellectual disability, depression and anxiety. approximately 90% of patients will have at least 1 symptom of tand. lymphangioleiomyomatosis (lam) occurs in the lung and may result in pneumothorax, cystic lung destruction and pleural effusions. symptoms which occur as a result may include fatigue, chest pain and shortness of breath. it occurs in approximately 30-40% of women with tsc, up to 80% by the age of 40, and it is much less common in men. renal angiomyolipomas and cysts are the most common manifestations of tsc involving the kidney. renal disease is among the most common causes of early death in tsc. one study found that renal lesions were present in 80% of patients by a mean age of 10.5 years. renal cell carcinoma occurs in 2-5% of patients with tsc at a mean age of 28–30 years. cardiac rhabdomyomas are benign hamartomas and are the most common cardiac manifestations of tsc. it is found in approximately two-third of newborns with tsc. most of the time they do not cause symptoms and spontaneously regress. in a minority of cases, they may result in heart failure, arrhythmias, and murmurs. dermatological manifestations occur in almost all patients and may include facial angiofibromas, confetti skin lesions, ungual fibromas, shagreen patches, hypomelanotic macules and fibrous cephalic plaques. none of these tend to result in significant complications however facial angiofibromas may cause significant cosmetic concerns. sturge–weber syndrome port wine stains of an 8-year-old female with sturge-weber syndrome sturge-weber syndrome occurs in approximately 1 in 20,000-50,000 live births and is caused by a somatic activating mutation in gnaq. normally, gnaq is involved in cell growth signal transmission. it is classically characterized by a facial port-wine stain in the ophthalmic division of the trigeminal nerve, glaucoma and leptomeningeal angioma. however, the clinical presentation can vary significantly depending on the timing of the somatic mutation ranging from an isolated port-wine stain to complete sturge-weber syndrome. the characteristic port-wine stain, also called nevus flammeus, is caused by a capillary or venular malformation. it is present from birth while the extent and size of it is associated with the risk of leptomeningeal and ophthalmologic involvement. the greatest risk is associated with port-wine stains that appear to involve the entire v1 distribution followed by partial v1 involvement. there is ontroversy as to whether or not the distribution of port-wine stains truly follows trigeminal nerve branches per se. port-wine stains are most often unilateral but can be bilateral. typically, brain and eye involvement occur on the same side as the port-wine stain. over time, port-wine stains can develop soft tissue or bone hypertrophy, proliferative nodules, and progressive ectasia which can lead to significant disfigurement. the two most common ocular manifestations include glaucoma and choroidal hemagioma. glaucoma is estimated to occur in 30-70% with a bimodal peak occurring at the time of birth in 60% and between childhood and adolescence in 40%. the most frequent form of glaucoma is open-angle however closed-angle