Harlequin-type ichthyosis is a genetic disorder which results in thickened skin over nearly the Synonyms, Harlequin ichthyosis, hyosis fetalis, keratosis diffusa fetalis, harlequin fetus ichthyosis congenita gravior. Harlequin Autosomal recessive congenital ichthyosis (ARCI) encompasses several forms of nonsyndromic ichthyosis. Although most neonates with ARCI. German, kongenitale Ichthyose, Ichthyosis kongenital, Ichthyosis congenita, Ichthyosis Spanish, Ictiosis congénita, ictiosis congénita, SAI, ictiosis congénita .

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The disorder is inherited as a fully penetrant autosomal recessive and in general, its features are very similar to those of human harlequin ichthyosis. All individuals homozygous for a detrimental loss-of-function allele had the most severe and fatal course of harlequin ichthyosis.

Williams noted that there may be biochemical differences. Infobox medical condition new All articles with unsourced statements Articles with unsourced statements from August Articles with unsourced statements from October Commons category link from Wikidata. Ichthyosis, congenital, autosomal recessive Retrieved 18 July Assignment of the locus for ichthyosis prematurity syndrome to chromosome 9q CYP4F22 encodes a protein of amino acids that is predicted to include a signal peptide of 48 or 49 residues and a large CYP domain residues Revised nomenclature and classification of inherited ichthyoses: Traupe argued that ‘pleomorphic’ was not an ideal term since in most cases the ichthyosis simply improves, and suggested ‘congenital ichthyosis with mild scaling’ CIMS.

Ichthyosis – Wikipedia

The authors concluded that severe corneal damage and visual loss could occur in LI even in the absence of upper or lower ectropion.

The authors noted that the vast majority of ABCA12 mutations associated with harlequin ichthyosis are predicted to result in a truncated ictjosis, although 1 patient was homozygous for a missense mutation Echogenic sediment in the ictioais fluid has been described on fetal ultrasound in pregnancies with IPS.


The vast majority of individuals with the classic LI phenotype have TGM1 pathogenic variants; many persons with much milder non-erythrodermic phenotypes also have TGM1 pathogenic variants. Aplasia cutis congenita Amniotic band syndrome Branchial cyst Cavernous venous malformation Accessory nail of the fifth toe Bronchogenic cyst Congenital cartilaginous rest of the neck Congenital hypertrophy of the lateral fold of congenjta hallux Congenital lip pit Congenital malformations of the dermatoglyphs Congenital preauricular fistula Congenital smooth muscle hamartoma Cystic lymphatic malformation Median raphe cyst Melanotic neuroectodermal tumor of infancy Mongolian spot Nasolacrimal duct cyst Ictoosis duct cyst Poland anomaly Rapidly involuting congenital hemangioma Rosenthal—Kloepfer syndrome Skin dimple Superficial lymphatic malformation Thyroglossal duct cyst Verrucous vascular malformation Birthmark.

Comments on the proposed term pleomorphic ichthyosis.

There was a high frequency of mutated arginine codons, most likely due to the deamination of CpG dinucleotides. Prevention of infection, dehydration and overheating, corneal drying; high caloric diet; when necessary, release of collodion membrane congennita digits to maintain circulation and on the thorax for adequate respiration. A number sign is used with this entry because of evidence that the harlequin fetus type of congenital ichthyosis, here symbolized ARCI4B, is caused by homozygous or compound heterozygous mutation in the ABCA12 gene on chromosome 2q Cnogenita transglutaminase-1 gene maps to the same region and encodes one of the enzymes responsible for crosslinking epidermal proteins during formation of the stratum corneum.


Electron microscopy did not reveal cholesterol clefts or lipid droplets in the thickened corneal congenkta. Keratitis-ichthyosis-deafness KID syndrome OMIMan autosomal dominant disorder, is characterized by vascularizing keratitis, congenital ichthyosis, palmoplantar keratoderma, and sensorineural hearing loss.


Pathogenic variants have not been identified in any of the following situations: LI and CIE are seemingly distinct phenotypes: Trisomic rescue causing reduction to homozygosity for a novel ABCA12 mutation in harlequin ichthyosis.

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Ichthyosis bullosa of Siemens Ichthyosis follicularis Ichthyosis prematurity syndrome Ichthyosis—sclerosing cholangitis syndrome Nonbullous congenital ichthyosiform erythroderma Ichthyosis linearis circumflexa Ichthyosis hystrix. Although access to this page is not restricted, the information found here is intended for use by medical providers.

It is characterized by the presence of a coongenita membrane encasing the newborn.

Genotypic and clinical spectrum of self-improving collodion congeita More detailed information for clinicians ordering genomic testing can be found here. Differential diagnosis HI may be confused with the less severe appearance of collodion baby.

Infants are usually born encased in a collodion membrane which sheds within a few weeks. The skin was dry and hard and seemed to be cracked in many places, somewhat resembling the scales of a fish. Note on variant classification: It appeared that the tight skin did not permit growth of the fingers.