{"Name":"Marshall-Smith syndrome","DiseaseID__c":"GARD:0006985","id":6985,"encodedName":"marshall-smith-syndrome","IsDeleted":false,"Disease_Name_Full__c":"Marshall-Smith syndrome","Xref_IDs__c":"423022231; 73284007; C0265211; C536026; DOID:0050858; MEDGEN:75551; MONDO:0011244; OMIM:602535; ORPHA:561","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":6,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":1,"World_Estimate__c":"1 to 8,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":1,"No_of_Disease_Descriptions__c":4,"Disease_Characteristics_Score__c":7,"No_of_Age_at_Onset__c":2,"Description_Source__c":"MONDO:0011244","Disease_Description__c":"A rare genetic multiple congenital anomalies syndrome characterized by abnormal bone maturation with skeletal anomalies, airway obstructions, failure to thrive, developmental delay, moderate to severe intellectual disability and characteristic facial features with macrocephaly, prominent forehead, shallow orbits, proptosis and blue sclerae.","GARD_Name__c":"Marshall-Smith syndrome","GARD_Synonym__c":"accelerated skeletal maturation-facial dysmorphism-failure to thrive syndrome; accelerated skeletal maturation, facial dysmorphism, failure to thrive syndrome; mrshss","Curated_Disease_Description_Source__c":"GARD:0006985","Curated_Disease_Description__c":"Marshall-Smith syndrome (MRSHSS) is a genetic disorder in which individuals typically have advanced bone age, difficulties gaining weight (failure to thrive), unique facial features, and intellectual disability. Other signs and symptoms of this condition may include eye abnormalities, breathing difficulties, and neurological issues. Individuals may also have heart defects, an increased amount of body hair (hirsutism), and flat feet (pes planus). MRSHSS is caused by genetic changes in the NFIX gene. Most individuals with MRSHSS are the first in their family with this condition and are said to have a spontaneous (de novo) genetic change.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"as a Newborn and as an Infant","SourceID__c":"ORPHA:561","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0011244","ORPHANET_ID__c":"ORPHA:561","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Síndrome de marshall-smith","Spanish_Description_Source__c":"ORPHA:561","Spanish_Description__c":"Es un síndrome de múltiples malformaciones congénitas, de origen genético y poco frecuente, caracterizado por una alteración de la maduración ósea con anomalías esqueléticas, obstrucción de las vías respiratorias, fallo de medro, retraso psicomotor, discapacidad intelectual de moderada a grave y rasgos faciales característicos con macrocefalia, frente prominente, órbitas superficiales, proptosis y escleróticas azules.","Spanish_Disease_Name__c":"síndrome de marshall-smith","Spanish_GARD_Synonym__c":"síndrome de maduración esquelética acelerada-dismorfia facial-falta de crecimiento","Category_Linearization__c":"ORPHA:93890","icd10_id__c":null,"mesh_id__c":null,"omim_id__c":null,"snomed_id__c":null,"umls_id__c":null,"GARD_Disease__c":[{"Curated_Disease_Description__c":"Marshall-Smith syndrome (MRSHSS) is a genetic disorder in which individuals typically have advanced bone age, difficulties gaining weight (failure to thrive), unique facial features, and intellectual disability. Other signs and symptoms of this condition may include eye abnormalities, breathing difficulties, and neurological issues. Individuals may also have heart defects, an increased amount of body hair (hirsutism), and flat feet (pes planus). MRSHSS is caused by genetic changes in the NFIX gene. Most individuals with MRSHSS are the first in their family with this condition and are said to have a spontaneous (de novo) genetic change.","Curated_Disease_Description_Source__c":"GARD:0006985","GARD_Synonym__c":"accelerated skeletal maturation-facial dysmorphism-failure to thrive syndrome; accelerated skeletal maturation, facial dysmorphism, failure to thrive syndrome; mrshss","Name":"Marshall-Smith syndrome","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Marshall-Smith Syndrome Organization of the USA","Website__c":"https://www.mss-usa.org"},{"Account_Name__c":"MSS (Marshall-Smith Syndrome) Research Foundation","Website__c":"https://marshallsmith.org/en/"}],"GARD_Disease_Tag__c":[{"Tag_Name__c":"Genetics","Tag_Category__c":"Cause;Disease Category;Specialist","category_description":"Genetic diseases affect the DNA, or genetic instructions, which directs how tissues, organs, and body systems function.","curated_tag_name":"Genetic diseases"},{"Tag_Name__c":"Neurology","Tag_Category__c":"Disease Category;Specialist","category_description":"Neurological diseases affect the brain, spinal cord, cranial nerves, autonomic nerves, or other peripheral nerves.","curated_tag_name":"Neurological diseases"},{"Tag_Name__c":"Endocrine","Tag_Category__c":"Disease Category;Specialist","category_description":"Endocrine diseases affect hormone production or how the body responds to a specific hormone(s).","curated_tag_name":"Endocrine diseases"},{"Tag_Name__c":"Congenital Abnormality","Tag_Category__c":"Disease Category","category_description":"Birth defects are structural changes present at birth that can affect almost any part of the body, including how the body looks, works, or both.","curated_tag_name":"Birth defects"},{"Tag_Name__c":"Orthopedics","Tag_Category__c":"Specialist"},{"Tag_Name__c":"Neurodevelopmental disabilities","Tag_Category__c":"Specialist","curated_tag_name":"Neurodevelopmental disabilities"},{"Tag_Name__c":"Pediatrics","Tag_Category__c":"Specialist"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Neonatal","Provided_By__c":"ORPHA:561"},{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:561"}],"Diagnosis__c":[{"Type__c":"GTR","Curie__c":"MEDGEN:C0265211"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0006985","Source__c":"RareSource"},{"URL__c":"https://www.omim.org/entry/602535","Source__c":"C0265211; MONDO:0011244; ORPHA:561","Xref__c":"OMIM:602535"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=75551","Source__c":"C0265211","Xref__c":"MEDGEN:75551"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0050858","Source__c":"MONDO:0011244","Xref__c":"DOID:0050858"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C536026","Source__c":"MONDO:0011244","Xref__c":"C536026"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C0265211","Source__c":"C0265211","Xref__c":"C0265211"},{"URL__c":"https://www.orpha.net/en/disease/detail/561","Source__c":"C0265211; MONDO:0011244; ORPHA:561","Xref__c":"ORPHA:561"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=73284007","Source__c":"C0265211; MONDO:0011244","Xref__c":"73284007"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0011244","Source__c":"GARD:0006985","Xref__c":"MONDO:0011244"},{"URL__c":"https://secure.ssa.gov/apps10/poms.nsf/lnx/0423022231","Xref__c":"423022231"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"NFIX","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal dominant"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A bending or abnormal curvature of a long bone.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006487","HPO_Synonym__c":"Bowed long bones; Bowing of long bones; Bowing of the long bones; Camptomelia; Diaphyseal bowing; Diaphyseal bowing of long bones","HPO_Name__c":"Bowing of the long bones","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An increase in size of the ventricular system of the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002119","HPO_Synonym__c":"Cerebral ventricular dilatation; Dilated cerebral ventricle; Dilated cerebral ventricles; Dilated ventricles; Enlarged cerebral ventricles; Enlarged ventricles; Enlarged ventricular system; Large cerebral ventricles and cisternae; Ventricular dilatation","HPO_Name__c":"Ventriculomegaly","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An eye that is protruding anterior to the plane of the face to a greater extent than is typical.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000520","HPO_Synonym__c":"Anterior bulging of the globe; Anterior bulging of the globe of eye; Bulging eye; Exophthalmos; Eyeballs bulging out; Ocular proptosis; Prominent eyes; Prominent globes; Protruding eyes; Protrusio bulbi","HPO_Name__c":"Proptosis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A facial appearance characterized by a permanently or nearly permanently opened mouth.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000194","HPO_Synonym__c":"Gaped jawed appearance; Gaped mouthed appearance; Open mouth; Slack jawed appearance","HPO_Name__c":"Open mouth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal bluish coloration of the sclera.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000592","HPO_Synonym__c":"Blue sclera; Bluish sclerae; Gray sclerae; Whites of eyes are a bluish-gray color","HPO_Name__c":"Blue sclerae","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Anteriorly-facing nostrils viewed with the head in the Frankfurt horizontal and the eyes of the observer level with the eyes of the subject. This gives the appearance of an upturned nose (upturned nasal tip).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000463","HPO_Synonym__c":"Anteverted nose; Anteverted nostrils; Nasal tip, upturned; Nostrils anteverted; Upturned nares; Upturned nasal tip; Upturned nose; Upturned nostrils","HPO_Name__c":"Anteverted nares","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001508","HPO_Synonym__c":"Faltering weight; FTT; Postnatal failure to thrive; Weight faltering","HPO_Name__c":"Failure to thrive","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Distance from nasion to subnasale more than two standard deviations below the mean, or alternatively, an apparently decreased length from the nasal root to the nasal tip.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003196","HPO_Synonym__c":"Decreased length of nose; Hypoplastic nose; Nasal hypoplasia; Short nose; Shortened nose","HPO_Name__c":"Short nose","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An ecchymosis (bruise) refers to the skin discoloration caused by the escape of blood into the tissues from ruptured blood vessels. This term refers to an abnormally increased susceptibility to bruising. The corresponding phenotypic abnormality is generally elicited on medical history as a report of frequent ecchymoses or bruising without adequate trauma.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000978","HPO_Synonym__c":"Bruisability; Bruise easily; Bruising susceptibility; Easy bruisability; Easy bruising","HPO_Name__c":"Bruising susceptibility","Feature_System__c":"Skin System; Cardiovascular System; Blood and Blood-Forming Tissue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduction in thickness of the skin, generally associated with a loss of suppleness and elasticity of the skin.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000963","HPO_Synonym__c":"Thin skin","HPO_Name__c":"Thin skin","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduced diameter of a long bone.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003100","HPO_Synonym__c":"Gracile long bones; Long bones slender; Slender long bone; Slender, gracile long tubular bones; Thin long bones; Thin, gracile long bones","HPO_Name__c":"Slender long bone","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The presence of an abnormal lateral curvature of the spine.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002650","HPO_Name__c":"Scoliosis","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormality of vibrational conductance of sound to the inner ear leading to impairment of sensory perception of sound.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000405","HPO_Synonym__c":"Conduction deafness; Conductive deafness; Conductive hearing loss; Hearing loss, conductive","HPO_Name__c":"Conductive hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The term intellectual disability or intellectual developmental disorder is used to describe significantly sub-average intellectual and adaptive functioning based on clinical assessment and as measured by individually administered, appropriately normed, standardized and validated tests of intellectual functioning and adaptive behavior, with onset during the developmental period from infancy through adolescence.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001249","HPO_Synonym__c":"Intellectual disability; Mental deficiency; Mental retardation; Mental retardation, nonspecific; Mental-retardation; Nonprogressive intellectual disability; Nonprogressive mental retardation","HPO_Name__c":"Intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Interpupillary distance more than 2 SD above the mean (alternatively, the appearance of an increased interpupillary distance or widely spaced eyes).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000316","HPO_Synonym__c":"Excessive orbital separation; Increased distance between eye sockets; Increased distance between eyes; Increased interpupillary distance; Ocular hypertelorism; Wide-set eyes; Widely spaced eyes; Widened interpupillary distance","HPO_Name__c":"Hypertelorism","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A reduction of bone mineral density, that is, of the amount of matter per cubic centimeter of bones.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004349","HPO_Synonym__c":"Decreased bone mineral density; Decreased bone mineral density Z score; Low solidness and mass of the bones","HPO_Name__c":"Reduced bone mineral density","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Abnormally increased hair growth over much of the entire body.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002230","HPO_Synonym__c":"Excessive hairiness over body","HPO_Name__c":"Generalized hirsutism","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality in which the mandible is mislocalised posteriorly.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000278","HPO_Synonym__c":"Lower jaw retrognathia; Lower jaw retrusion; Mandibular retrognathia; Mandibular retrusion; Receding chin; Receding lower jaw; Receding mandible; Retrognathia of lower jaw; Retrusion of lower jaw; Weak chin; Weak jaw","HPO_Name__c":"Retrognathia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormally increased rate of skeletal maturation. Accelerated skeletal maturation can be diagnosed on the basis of an estimation of the bone age from radiographs of specific bones in the human body.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005616","HPO_Synonym__c":"Advanced bone age; Early bone maturation; Premature epiphyseal closure; Premature epiphyseal ossification; Premature fusion of the epiphyseal growth plate","HPO_Name__c":"Accelerated skeletal maturation","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Tongue extending beyond the alveolar ridges or teeth at rest.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010808","HPO_Synonym__c":"Lingual prolapse; Lingual prominence; Lingual protrusion; Prolapse of tongue; Prominent tongue; Protruding tongue; Tongue protrusion; Tongue sticking out of mouth","HPO_Name__c":"Protruding tongue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Any structural anomaly of the heart and blood vessels.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030680","HPO_Synonym__c":"Abnormality of cardiovascular system morphology; Cardiovascular malformations","HPO_Name__c":"Abnormal cardiovascular system morphology","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Cerebellar hypoplasia is a descriptive term implying a cerebellum with a reduced volume, but a normal shape and is stable over time.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001321","HPO_Synonym__c":"Congenital cerebellar hypoplasia; Hypoplasia of cerebellum; Hypoplastic cerebellum; Small cerebellum; Underdeveloped cerebellum","HPO_Name__c":"Cerebellar hypoplasia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Craniosynostosis refers to the premature closure of the cranial sutures. Primary craniosynostosis refers to the closure of one or more sutures due to abnormalities in skull development, and secondary craniosynostosis results from failure of brain growth.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001363","HPO_Synonym__c":"Cranial suture synostosis; Craniosyostosis; Early fusion of cranial sutures; Premature closure of cranial sutures; Premature suture closure","HPO_Name__c":"Craniosynostosis","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The capability that a joint (or a group of joints) has to move, passively and/or actively, beyond normal limits along physiological axes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001382","HPO_Synonym__c":"Double-Jointed; Extensible joints; Flexible joints; Hyperextensible joints; Increased joint mobility; Increased mobility of joints; Joint hyperextensibility; Joint hyperflexibility; Joint hyperlaxity; Joint laxity; Joints move beyond expected range of motion; Lax joints; Loose-jointedness","HPO_Name__c":"Joint hypermobility","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormally increased tendency to fractures of bones caused by an abnormal reduction in bone strength that is generally associated with an increased risk of fracture.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002659","HPO_Synonym__c":"Abnormal susceptibility to fractures; Bone fragility; Frequent broken bones; Increased bone fragility; Increased susceptibility to fractures; Increased tendency to fractures","HPO_Name__c":"Increased susceptibility to fractures","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Hyperplasia of the gingiva (that is, a thickening of the soft tissue overlying the alveolar ridge. The degree of thickening ranges from involvement of the interdental papillae alone to gingival overgrowth covering the entire tooth crown.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000212","HPO_Synonym__c":"Gingival enlargement; Gingival hyperplasia; Gum enlargement; Gum hypertrophy; Hypertrophic gingivitis","HPO_Name__c":"Gingival overgrowth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Absence or abnormal closure of the choana (the posterior nasal aperture). Most embryologists believe that posterior choanal atresia results from a failure of rupture between the 35th and 38th day of fetal life of the partition which separates the bucconasal or buccopharyngeal membranes. The resultant choanal atresia may be unilateral or bilateral, bony or membranous, complete or incomplete. In over 90 per cent of cases the obstruction is bony, while in the remainder it is membranous. The bony type of atresia is commonly located 1-2 mm. anterior to the posterior edge of the hard palate, and the osseous septum varies in thickness from 1 to 10 mm. In the membranous form of choanal atresia the obstruction usually occurs further posteriorly. In approximately one third of cases the atresia is bilateral.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000453","HPO_Synonym__c":"Blockage of the rear opening of the nasal cavity","HPO_Name__c":"Choanal atresia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Atrophy of the optic nerve. Optic atrophy results from the death of the retinal ganglion cell axons that comprise the optic nerve and manifesting as a pale optic nerve on fundoscopy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000648","HPO_Synonym__c":"Optic nerve atrophy; Optic-nerve degeneration","HPO_Name__c":"Optic atrophy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:561","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Forward prominence of the entire forehead, due to protrusion of the frontal bone.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011220","HPO_Synonym__c":"Prominence of frontal region; Prominent forehead; Pronounced forehead; Protruding forehead","HPO_Name__c":"Prominent forehead","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology","Endocrine","Congenital Abnormality"],"Specialist":["Genetics","Neurology","Endocrine","Orthopedics","Neurodevelopmental disabilities","Pediatrics"]},"synonyms":["accelerated skeletal maturation-facial dysmorphism-failure to thrive syndrome"," accelerated skeletal maturation, facial dysmorphism, failure to thrive syndrome"," mrshss"]}