Ichthyosis hystrix: Difference between revisions

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{{Short description|A rare skin disorder characterized by thick, spiny scales}}
| name            = Ichthyosis hystrix
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'''Ichthyosis hystrix''' is a group of rare skin disorders in the [[ichthyosis]] family of skin disorders characterized by massive [[hyperkeratosis]] with an appearance like spiny scales.<ref name="dermis">[http://dermis.net/dermisroot/en/40310/diagnose.htm ''Ichthyosis hystrix''], DermIS</ref> This term is also used to refer to a type of epidermal [[nevi]] with extensive bilateral distribution.<ref name="dermis" /><ref name="Fitz2">{{cite book |author=Freedberg|title=Fitzpatrick's Dermatology in General Medicine |publisher=McGraw-Hill |year=2003 |isbn=0-07-138076-0 |page=771 |edition=6th|display-authors=etal}}</ref>
'''Ichthyosis hystrix''' is a rare form of [[ichthyosis]], a group of skin disorders characterized by dry, scaly skin. The term "hystrix" refers to the spiny or bristly appearance of the skin, reminiscent of a porcupine's quills. This condition is typically present at birth or develops in early childhood and can vary in severity.
==Types==
===Ichthyosis hystrix, Curth-Macklin type===
[[File:Tilesius.jpg|200px|thumb|right|Edward Lambert, an Englishman who suffered from ichthyosis hystrix.]]


The symptoms of ichthyosis hystrix Curth-Macklin are similar to [[epidermolytic hyperkeratosis]] (NPS-2 type) but there is no blistering and the hyperkeratosis is verrucous or spine-like. The hyperkeratosis is brown-grey in colour and is most obvious on the arms and legs. It is an [[autosomal dominant]] condition and can be caused by errors to the [[KRT1]] gene.<ref>{{OMIM|146590|Ichthyosis hystrix, Curth-Macklin type}}</ref><ref>{{cite web |title=Ichthyosis hystrix of Curth-Macklin |work=Rare Disease Registry |publisher=University of Padua |url=http://malattierare.regione.veneto.it/}}</ref> It is named after [[Helen Ollendorff Curth]] (1899-1982), a German-Jewish dermatologist, and [[Madge Thurlow Macklin]] (1893–1962),<ref>{{cite journal |author=Al Aboud, Khalid |author2=Al Aboud, Daifullah |title=Helen Ollendorff Curth and Curth-Macklin Syndrome |journal=The Open Dermatology Journal |volume=5 |pages=28–30 |year=2011  |url=http://www.benthamscience.com/open/todj/articles/V005/28TODJ.pdf |doi=10.2174/1874372201105010028}}</ref> an American medical geneticist, and is one of the first syndromes named after two women.<ref>{{cite journal |vauthors=Burgdorf WH, Scholz A |title=Helen Ollendorff Curth and William Curth: from Breslau and Berlin to Bar Harbor |journal=J. Am. Acad. Dermatol. |volume=51 |issue=1 |pages=84–9 |date=July 2004 |pmid=15243529 |doi=10.1016/j.jaad.2003.12.035 |url=}}</ref>
==Presentation==
Individuals with ichthyosis hystrix exhibit thickened skin with a spiny texture. The scales are often dark and can cover large areas of the body, including the trunk, limbs, and sometimes the face. The severity of the condition can range from mild to severe, impacting the individual's quality of life.


===Ichthyosis hystrix, Lambert type===
==Genetics==
Also known as '''ichthyosis hystrix gravior''' or '''porcupine man'''. This disease is characterised by spiny scales which cover the entire body except the face, genitals, palms and soles.  The only known cases were in Edward Lambert (known as the porcupine man) who was exhibited in front of the Royal Society in London in 1731 and three generations of his descendants. No cases of this disease are now known though some experts believe that it may have been a type of [[epidermolytic hyperkeratosis]]. From the history of the Lambert family the disease appears to have been an [[autosomal dominant]] condition.<ref name="dermis" /><ref>{{OMIM|146600|Ichthyosis hystrix gravior}}</ref>
Ichthyosis hystrix is often inherited in an [[autosomal dominant]] pattern, meaning a single copy of the altered gene in each cell is sufficient to cause the disorder. However, the specific genetic mutations responsible for ichthyosis hystrix are not well understood and may vary among affected individuals.


===Hystrix-like ichthyosis with deafness syndrome===
==Pathophysiology==
'''HID syndrome''' is also known as '''ichthyosis hystrix, Rheydt type''' after the German city of [[Rheydt]] near Düsseldorf where it was first discovered. Symptoms are bilateral hearing loss and spiky hyperkeratotic masses which cover the whole body though the palms and soles are less badly affected. It can be differentiated from [[KID syndrome]] which also has symptoms of deafness and ichthyosis by the different distribution of hyperkeratosis. It is an [[autosomal dominant]] condition caused by a mutation to the [[GJB2]] gene (the same gene affected by KID syndrome).<ref>{{cite journal |vauthors=König A, Küster W, Berger R, Happle R |title=Autosomal dominant inheritance of HID syndrome (hystrix-likeichthyosis with deafness) |journal=European Journal of Dermatology |volume=7 |issue=8 |pages=554–5 |date=December 1997 |url=http://www.jle.com/en/revues/medecine/ejd/e-docs/00/01/89/28/article.phtml}}</ref><ref>{{OMIM|602540|Ichthyosis, Hystrix-like, with deafness}}</ref>
The condition is characterized by abnormal [[keratinization]], the process by which skin cells form, mature, and are shed. In ichthyosis hystrix, this process is disrupted, leading to the accumulation of thick, scaly skin. The exact mechanisms underlying this disruption are not fully understood but are believed to involve defects in the proteins that regulate skin cell turnover.


===Ichthyosis hystrix, Baefvertstedt type===
An extremely rare disease of which only a few isolated cases are known.<ref name="dermis" />
==Diagnosis==
==Diagnosis==
{{Empty section|date=February 2018}}
Diagnosis of ichthyosis hystrix is primarily clinical, based on the characteristic appearance of the skin. A [[skin biopsy]] may be performed to confirm the diagnosis and rule out other forms of ichthyosis. Genetic testing can be used to identify mutations associated with the condition, although this is not always available or necessary.
==Treatment==
{{Empty section|date=February 2018}}
== See also ==
* [[List of cutaneous conditions]]
* [[List of cutaneous conditions caused by mutations in keratins]]
* [[List of radiographic findings associated with cutaneous conditions]]


==References==
==Management==
{{reflist}}
There is no cure for ichthyosis hystrix, but treatment focuses on managing symptoms and improving skin condition. Common treatments include:
== External links ==
* Regular use of [[emollients]] and moisturizers to hydrate the skin and reduce scaling.
{{Medical resources
* Topical [[keratolytics]] such as [[salicylic acid]] or [[urea]] to help remove scales.
|  DiseasesDB      =
* In some cases, [[retinoids]] may be prescribed to reduce skin thickening.
|  ICD10          = {{ICD10|Q|80|8|q|80}}
 
|  ICD9            =
==Prognosis==
|  ICDO            =
The prognosis for individuals with ichthyosis hystrix varies depending on the severity of the condition. While it is a lifelong disorder, symptoms can often be managed effectively with appropriate treatment. However, severe cases may lead to complications such as skin infections or impaired mobility due to skin stiffness.
|  OMIM            = 146590 
 
|  OMIM_mult      = {{OMIM2|146600}} {{OMIM2|602540}} 
==Related pages==
|  MedlinePlus    =
* [[Ichthyosis]]
|  eMedicineSubj  =
* [[Keratinization]]
|  eMedicineTopic  =
* [[Genetic disorders]]
|  MeshID          =  
}}
{{Congenital malformations and deformations of integument}}
{{Cytoskeletal defects}}
{{Channelopathy}}


[[Category:Epidermal nevi, neoplasms, cysts]]
[[Category:Genodermatoses]]
[[Category:Genodermatoses]]
[[Category:Rare diseases]]
[[Category:Rare diseases]]
[[Category:Cytoskeletal defects]]
[[Category:Skin conditions resulting in hyperkeratosis]]

Revision as of 19:27, 22 March 2025

A rare skin disorder characterized by thick, spiny scales



Ichthyosis hystrix is a rare form of ichthyosis, a group of skin disorders characterized by dry, scaly skin. The term "hystrix" refers to the spiny or bristly appearance of the skin, reminiscent of a porcupine's quills. This condition is typically present at birth or develops in early childhood and can vary in severity.

Presentation

Individuals with ichthyosis hystrix exhibit thickened skin with a spiny texture. The scales are often dark and can cover large areas of the body, including the trunk, limbs, and sometimes the face. The severity of the condition can range from mild to severe, impacting the individual's quality of life.

Genetics

Ichthyosis hystrix is often inherited in an autosomal dominant pattern, meaning a single copy of the altered gene in each cell is sufficient to cause the disorder. However, the specific genetic mutations responsible for ichthyosis hystrix are not well understood and may vary among affected individuals.

Pathophysiology

The condition is characterized by abnormal keratinization, the process by which skin cells form, mature, and are shed. In ichthyosis hystrix, this process is disrupted, leading to the accumulation of thick, scaly skin. The exact mechanisms underlying this disruption are not fully understood but are believed to involve defects in the proteins that regulate skin cell turnover.

Diagnosis

Diagnosis of ichthyosis hystrix is primarily clinical, based on the characteristic appearance of the skin. A skin biopsy may be performed to confirm the diagnosis and rule out other forms of ichthyosis. Genetic testing can be used to identify mutations associated with the condition, although this is not always available or necessary.

Management

There is no cure for ichthyosis hystrix, but treatment focuses on managing symptoms and improving skin condition. Common treatments include:

Prognosis

The prognosis for individuals with ichthyosis hystrix varies depending on the severity of the condition. While it is a lifelong disorder, symptoms can often be managed effectively with appropriate treatment. However, severe cases may lead to complications such as skin infections or impaired mobility due to skin stiffness.

Related pages

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