National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

Pseudotrisomy 13 syndrome



Other Names:
Holoprosencephaly polydactyly syndrome; Pseudo trisomy 13 syndrome; Young-Maders syndrome
Categories:

The following summary is from Orphanet, a European reference portal for information on rare diseases and orphan drugs.
orphanet

Orpha Number: 2166

Definition
Holoprosencephaly-postaxial polydactyly syndrome associates, in chromosomally normal neonates, holoprosencephaly, severe facial dysmorphism, postaxial polydactyly and other congenital abnormalities, suggestive of trisomy 13 (see this term).

Epidemiology
Incidence is unknown.

Clinical description
Dysmorphic features include hypotelorism, severe eye anomalies such as microphtalmia or anophtalmia, premaxillary region aplasia and cleft lip and palate. Congenital cardiac anomalies are common.

Antenatal diagnosis
Antenatal diagnosis is possible by ultrasonographic monitoring.

Genetic counseling
The condition seems to be inherited as an autosomal recessive trait.

Prognosis
Prognosis is poor.

Visit the Orphanet disease page for more resources.
Last updated: 1/1/2010

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms Other Names
Learn More:
HPO ID
80%-99% of people have these symptoms
Hypoplasia of penis
Underdeveloped penis
0008736
Hypoplasia of the premaxilla
Hypoplasia of the primary palate bone
Premaxillary bone deficiency
Primary palate bone deficiency
Small premaxilla
Small primary palate bone
Underdevelopment of the premaxilla
Underdevelopment of the primary palate bone
[ more ]
0010650
Hypotelorism
Abnormally close eyes
Closely spaced eyes
[ more ]
0000601
Microphthalmia
Abnormally small eyeball
0000568
Postaxial hand polydactyly
Extra little finger
Extra pinkie finger
Extra pinky finger
[ more ]
0001162
30%-79% of people have these symptoms
Abnormal cardiac septum morphology 0001671
Abnormal lung lobation 0002101
Abnormality of the hypothalamus-pituitary axis 0000864
Adrenal hypoplasia
Small adrenal glands
0000835
Ambiguous genitalia
Ambiguous external genitalia
Ambiguous external genitalia at birth
Intersex genitalia
[ more ]
0000062
Anal atresia
Absent anus
0002023
Aplasia/Hypoplasia of the corpus callosum 0007370
Cleft palate
Cleft roof of mouth
0000175
Cryptorchidism
Undescended testes
Undescended testis
[ more ]
0000028
Holoprosencephaly 0001360
Hydrocephalus
Too much cerebrospinal fluid in the brain
0000238
Hypospadias 0000047
Low-set, posteriorly rotated ears 0000368
Microcephaly
Abnormally small skull
Decreased circumference of cranium
Decreased size of skull
Reduced head circumference
Small head circumference
[ more ]
0000252
Muscular hypotonia
Low or weak muscle tone
0001252
Thyroid hypoplasia 0005990
5%-29% of people have these symptoms
Abnormal localization of kidney
Abnormal localisation of kidneys
0100542
Absent nares
Missing nostrils
0100596
Cerebellar hypoplasia
Small cerebellum
Underdeveloped cerebellum
[ more ]
0001321
Cyclopia
Cyclops eye
Single central eye
[ more ]
0009914
Encephalocele 0002084
Intestinal malrotation 0002566
Micrognathia
Little lower jaw
Small jaw
Small lower jaw
[ more ]
0000347
Narrow mouth
Small mouth
0000160
Omphalocele 0001539
Polyhydramnios
High levels of amniotic fluid
0001561
Renal hypoplasia/aplasia
Absent/small kidney
Absent/underdeveloped kidney
[ more ]
0008678
Talipes 0001883
Umbilical hernia 0001537
Percent of people who have these symptoms is not available through HPO
11 pairs of ribs 0000878
2-3 toe syndactyly
Webbed 2nd and 3rd toes
0004691
Abnormality of the respiratory system 0002086
Agenesis of corpus callosum 0001274
Atrial septal defect
An opening in the wall separating the top two chambers of the heart
Hole in heart wall separating two upper heart chambers
[ more ]
0001631
Autosomal recessive inheritance 0000007
Bicornuate uterus
Heart shaped uterus
Heart-shaped uterus
[ more ]
0000813
Coarctation of aorta
Narrowing of aorta
Narrowing of the aorta
[ more ]
0001680
Complete atrioventricular canal defect 0001674
Dextrocardia
Heart tip and four chambers point towards right side of body
0001651
Generalized hypotonia
Decreased muscle tone
Low muscle tone
[ more ]
0001290
Hemivertebrae
Missing part of vertebrae
0002937
Low-set ears
Low set ears
Lowset ears
[ more ]
0000369
Median cleft lip and palate
Central cleft lip and palate
Midline cleft lip/palate
[ more ]
0008501
Micropenis
Short penis
Small penis
[ more ]
0000054
Polymicrogyria
More grooves in brain
0002126
Postaxial foot polydactyly
Extra toe attached near the little toe
0001830
Posteriorly rotated ears
Ears rotated toward back of head
0000358
Renal agenesis
Absent kidney
Missing kidney
[ more ]
0000104
Renal hypoplasia
Small kidneys
Underdeveloped kidneys
[ more ]
0000089
Tricuspid atresia 0011662
Upslanted palpebral fissure
Upward slanting of the opening between the eyelids
0000582
Ventricular septal defect
Hole in heart wall separating two lower heart chambers
0001629
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Last updated: 7/1/2020

If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.

If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.

You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.

Healthcare Resources


Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease


These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

In-Depth Information

  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Pseudotrisomy 13 syndrome. Click on the link to view a sample search on this topic.

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