Impossible syndrome

Classification	D
External resources	Orphanet: 1424;

Impossible syndrome
Other names	Chondrodysplasia situs inversus imperforate anus polydactyly
	Impossible syndrome has an autosomal recessive pattern of inheritance.

Impossible Syndrome, is a complex combination of human congenital malformations (birth defects).[1]

The malformations include chondrodysplasia (improper growth of bone and cartilage), situs inversus totalis (chest and abdominal organs all a mirror image of normal), cleft larynx and epiglottis, hexadactyly (six digits) on hands and feet, diaphragmatic hernia, pancreatic abnormalities, kidney abnormal on one side and absent on the other side, micropenis and ambiguous genitalia, and imperforate anus.

Only one case of Impossible Syndrome has been reported; the infant was premature and stillborn.

Genetics

The inheritance of Impossible syndrome is suspected to be autosomal recessive, which means the affected gene is located on an autosome, and two copies of the gene - one from each parent - are required to have an infant with the disorder.

References

Fraser FC, Jequier S, Chen MF (1989). "Chondrodysplasia, situs inversus totalis, cleft epiglottis and larynx, hexadactyly of hands and feet, pancreatic cystic dysplasia, renal dysplasia/absence, micropenis and ambiguous genitalia, imperforate anus". Am J Med Genet. 34 (3): 401–405. doi:10.1002/ajmg.1320340316. PMID 2596528.

External links

Overview at Orphanet

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[Fraser-1] Fraser FC, Jequier S, Chen MF (1989). "Chondrodysplasia, situs inversus totalis, cleft epiglottis and larynx, hexadactyly of hands and feet, pancreatic cystic dysplasia, renal dysplasia/absence, micropenis and ambiguous genitalia, imperforate anus". Am J Med Genet. 34 (3): 401–405. doi:10.1002/ajmg.1320340316. PMID 2596528.

Congenital abnormality syndromes
Craniofacial	Acrocephalosyndactylia Apert syndrome Carpenter syndrome Pfeiffer syndrome Saethre–Chotzen syndrome Sakati–Nyhan–Tisdale syndrome Bonnet–Dechaume–Blanc syndrome Other Baller–Gerold syndrome Cyclopia Goldenhar syndrome Möbius syndrome
Short stature	1q21.1 deletion syndrome Aarskog–Scott syndrome Cockayne syndrome Cornelia de Lange syndrome Dubowitz syndrome Noonan syndrome Robinow syndrome Silver–Russell syndrome Seckel syndrome Smith–Lemli–Opitz syndrome Snyder–Robinson syndrome Turner syndrome
Limbs	Adducted thumb syndrome Holt–Oram syndrome Klippel–Trénaunay–Weber syndrome Nail–patella syndrome Rubinstein–Taybi syndrome Gastrulation/mesoderm: Caudal regression syndrome Ectromelia Sirenomelia VACTERL association
Overgrowth syndromes	Beckwith–Wiedemann syndrome Proteus syndrome Perlman syndrome Sotos syndrome Weaver syndrome Klippel–Trénaunay–Weber syndrome Benign symmetric lipomatosis Bannayan–Riley–Ruvalcaba syndrome Neurofibromatosis type I
Laurence–Moon–Bardet–Biedl	Bardet–Biedl syndrome Laurence–Moon syndrome
Combined/other, known locus	2 (Feingold syndrome) 3 (Zimmermann–Laband syndrome) 4/13 (Fraser syndrome) 8 (Branchio-oto-renal syndrome, CHARGE syndrome) 12 (Keutel syndrome, Timothy syndrome) 15 (Marfan syndrome) 19 (Donohue syndrome) Multiple Fryns syndrome