Ichthyosis hystrix: Difference between revisions

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{{Infobox medical condition (new)
 
{{Infobox medical condition
| name            = Ichthyosis hystrix
| name            = Ichthyosis hystrix
| synonyms        =  
| synonyms        = [[Porcupine man]]
| image          =
| field          = [[Dermatology]]
| caption        =
| symptoms        = Thickened skin, spiny scales
| pronounce      =
| complications  = [[Infection]], [[social stigma]]
| field          = dermatology
| onset          = [[Birth]] or early [[childhood]]
| meshName        =
| duration        = [[Lifelong]]
| meshNumber      =
| causes          = [[Genetic mutation]]
| symptoms        =  
| risks          = [[Family history]]
| complications  =  
| diagnosis      = [[Clinical examination]], [[genetic testing]]
| onset          =  
| differential    = [[Ichthyosis vulgaris]], [[epidermolytic hyperkeratosis]]
| duration        =  
| treatment      = [[Emollients]], [[keratolytics]], [[retinoids]]
| types          =
| frequency      = Rare
| causes          =  
| risks          =  
| diagnosis      =  
| differential    =  
| prevention      =
| treatment      =  
| medication      =
| prognosis      =
| frequency      =  
| deaths          =
}}
}}
 
{{Short description|A rare skin disorder characterized by thick, spiny scales}}
'''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>
{{Use dmy dates|date=October 2023}}
==Types==
'''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.
===Ichthyosis hystrix, Curth-Macklin type===
==Presentation==
[[File:Tilesius.jpg|200px|thumb|right|Edward Lambert, an Englishman who suffered from ichthyosis hystrix.]]
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==
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>
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==
===Ichthyosis hystrix, Lambert type===
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.
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>
 
===Hystrix-like ichthyosis with deafness syndrome===
'''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>
 
===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==
==Management==
{{Empty section|date=February 2018}}
There is no cure for ichthyosis hystrix, but treatment focuses on managing symptoms and improving skin condition. Common treatments include:
== See also ==
* Regular use of [[emollients]] and moisturizers to hydrate the skin and reduce scaling.
* [[List of cutaneous conditions]]
* Topical [[keratolytics]] such as [[salicylic acid]] or [[urea]] to help remove scales.
* [[List of cutaneous conditions caused by mutations in keratins]]
* In some cases, [[retinoids]] may be prescribed to reduce skin thickening.
* [[List of radiographic findings associated with cutaneous conditions]]
==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.
==References==
==Related pages==
{{reflist}}
* [[Ichthyosis]]
== External links ==
* [[Keratinization]]
{{Medical resources
* [[Genetic disorders]]
|  DiseasesDB      = 
|  ICD10          = {{ICD10|Q|80|8|q|80}}
|  ICD9            = 
|  ICDO            = 
|  OMIM            = 146590 
|  OMIM_mult      = {{OMIM2|146600}} {{OMIM2|602540}} 
|  MedlinePlus    = 
|  eMedicineSubj  = 
|  eMedicineTopic  = 
|  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]]

Latest revision as of 01:22, 4 April 2025


Ichthyosis hystrix
Synonyms Porcupine man
Pronounce N/A
Specialty N/A
Symptoms Thickened skin, spiny scales
Complications Infection, social stigma
Onset Birth or early childhood
Duration Lifelong
Types N/A
Causes Genetic mutation
Risks Family history
Diagnosis Clinical examination, genetic testing
Differential diagnosis Ichthyosis vulgaris, epidermolytic hyperkeratosis
Prevention N/A
Treatment Emollients, keratolytics, retinoids
Medication N/A
Prognosis N/A
Frequency Rare
Deaths N/A


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[edit]

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[edit]

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[edit]

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[edit]

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[edit]

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

Prognosis[edit]

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[edit]

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