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{{Lipoma}}
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==Overview==
==Overview==
Lipoma may be classified into 12 subtypes: adenolipomas, angiolipoleiomyomas, [[angiolipoma]], cerebellar pontine angle and internal auditory canal lipomas, chondroid lipomas, [[corpus callosum]], hibernomas, intradermal spindle cell lipomas, neural fibrolipomas, pleomorphic lipomas, spindle-cell lipomas, and superficial subcutaneous lipomas.
Lipoma may be [[Classification|classified]] into different subtypes depending on the [[classification]] system. They may be classified according to the [[anatomical]] location, the related [[tissues]] or other characteristics.
==Classification==
Lipomas can be [[Classification|classified]] according to their [[anatomical]] locations into:<ref name="Al-QattanAl-Lazzam2012">{{cite journal|last1=Al-Qattan|first1=M. M.|last2=Al-Lazzam|first2=A. M.|last3=Al Thunayan|first3=A.|last4=Al Namlah|first4=A.|last5=Mahmoud|first5=S.|last6=Hashem|first6=F.|last7=Tulbah|first7=A.|title=CLASSIFICATION OF BENIGN FATTY TUMOURS OF THE UPPER LIMB|journal=Hand Surgery|volume=10|issue=01|year=2012|pages=43–59|issn=0218-8104|doi=10.1142/S0218810405002541}}</ref>
*[[Dermal]]
*[[Subcutaneous]]
*[[Sub-fascial]]


==Classification==
Lipomas can be classified according to their [[anatomical]] locations into:<ref name="Al-QattanAl-Lazzam2012">{{cite journal|last1=Al-Qattan|first1=M. M.|last2=Al-Lazzam|first2=A. M.|last3=Al Thunayan|first3=A.|last4=Al Namlah|first4=A.|last5=Mahmoud|first5=S.|last6=Hashem|first6=F.|last7=Tulbah|first7=A.|title=CLASSIFICATION OF BENIGN FATTY TUMOURS OF THE UPPER LIMB|journal=Hand Surgery|volume=10|issue=01|year=2012|pages=43–59|issn=0218-8104|doi=10.1142/S0218810405002541}}</ref>
*Dermal
*Subcutaneous
*Subfascial
Another suggested [[classification]] is according to the related structure:
Another suggested [[classification]] is according to the related structure:
*Muscles-related lipoma
*[[Muscles]]-related lipoma
*Nerve-related lipoma
*[[Nerve]]-related lipoma
*Bone-related lipoma
*[[Bone]]-related lipoma
*Synovium-related lipoma
*[[Synovial]]-related lipoma
World health organization (WHO) classification system classified lipomatous tumors into the following subtypes:<ref name="BancroftKransdorf2006">{{cite journal|last1=Bancroft|first1=Laura W.|last2=Kransdorf|first2=Mark J.|last3=Peterson|first3=Jeffrey J.|last4=O’Connor|first4=Mary I.|title=Benign fatty tumors: classification, clinical course, imaging appearance, and treatment|journal=Skeletal Radiology|volume=35|issue=10|year=2006|pages=719–733|issn=0364-2348|doi=10.1007/s00256-006-0189-y}}</ref>
'''World health organization (WHO)''' [[classification]] system [[Classification|classified]] lipomatous [[tumors]] into the following sub types:<ref name="BancroftKransdorf2006">{{cite journal|last1=Bancroft|first1=Laura W.|last2=Kransdorf|first2=Mark J.|last3=Peterson|first3=Jeffrey J.|last4=O’Connor|first4=Mary I.|title=Benign fatty tumors: classification, clinical course, imaging appearance, and treatment|journal=Skeletal Radiology|volume=35|issue=10|year=2006|pages=719–733|issn=0364-2348|doi=10.1007/s00256-006-0189-y}}</ref>
*Lipoma
*Lipoma
*Lipomatosis
*[[Lipomatosis]]
*Lipomatosis of nerve
*Lipomatosis of [[nerve]]
*Lipoblastoma/lipoblastomatosis
*Lipoblastoma/lipoblastomatosis
*Angiolipoma
*[[Angiolipoma]]
*Myolipoma of soft tissue
*Myolipoma of [[soft tissue]]
*Chondroid lipoma
*Chondroid lipoma
*Spindle-cell lipoma/pleomorphic lipoma
*Spindle-cell lipoma/pleomorphic lipoma
*Hibernoma
*Hibernoma
 
'''Weiss and Goldblum''' classified Lipomatous [[tumors]] into the following subtypes. This [[classification]] system has shown more clinical utility.<ref>{{cite book | last = Goldblum | first = John | title = Enzinger and Weiss's soft tissue tumors | publisher = Saunders/Elsevier | location = Philadelphia, PA | year = 2014 | isbn = 9781455737635 }}</ref>
Lipomas have many subtypes as follows:
* Lipoma which may be classified as superficial or deep, single or multiple
There are many subtypes of lipomas:<ref name="Andrews">{{cite book| edition = 10th| publisher = Elsevier| isbn = 0-7216-2921-0| last = James| first = William D.| first2 = Timothy G. |last2=Berger|first3= Dirk M.|last3= Elston| title = Andrews' Diseases of the Skin: Clinical Dermatology|location=London|year=2005}}</ref>
*Variants of lipoma including:
*'''Adenolipomas''' are lipomas associated with [[eccrine sweat glands]].<ref name="Andrews new ed.">{{cite book| edition = 11th| publisher = Elsevier| isbn = 9781437703146| last = James| first = William D.| first2 = Timothy G. |last2=Berger|first3= Dirk M.|last3= Elston| title = Andrews' Diseases of the Skin: Clinical Dermatology|location=London|year=2011}}</ref>
**[[Angiolipoma]]
*'''Angiolipoleiomyomas''' are acquired, solitary, asymptomatic acral nodules, characterized histologically by well-circumscribed subcutaneous tumors composed of [[smooth muscle cells]], [[blood vessels]], [[connective tissue]], and fat.
**Myolipoma
*'''[[Angiolipoma]]s''' painful subcutaneous nodules having all other features of a typical lipoma.<ref name="Andrews" /><ref name="Bolognia">{{cite book |author=Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. |title=Dermatology: 2-Volume Set |publisher=Mosby |location=St. Louis |year=2007 |pages=1838 |isbn=1-4160-2999-0 |oclc= |doi= |accessdate=}}</ref>
**Chondroid lipoma
*'''Cerebellar pontine angle and internal auditory canal lipomas'''<ref>{{cite journal | author = Crowson MG, Symons SP, Chen JM | year = | title = Left cerebellopontine angle lipoma with mild brainstem compression in a 13-year-old female | url = | journal = Otology& Neurotology | volume = | issue = | page = }}</ref>
**Lipoblastoma
*'''Chondroid lipomas''' are deep-seated, firm, yellow tumors that characteristically occur on the legs of women.
**Lpindle-cell/pleomorphic lipoma
*'''[[Corpus callosum]] lipoma''' is a rare congenital brain condition that may or may not present with symptoms.<ref>{{cite journal |author=Wallace D |title=Lipoma of the corpus callosum |journal=J Neurol Neurosurg Psychiatry. |volume=39 |issue=12 |pages=1179–85 |date=December 1976 |pmid=1011028 |pmc=492562 |doi= 10.1136/jnnp.39.12.1179|url=}}</ref> This occurs in the corpus callosum, also known as the colossal commissure, which is a wide, flat bundle of neural fibers beneath the cortex in the human brain.
*Lipomatous tumors including:
*'''Hibernomas''' are lipoma of [[brown fat]].
**[[Intramuscular]] lipoma
*'''Intradermal spindle cell lipomas''' are distinct in that they most commonly affect women and have a wide distribution, occurring with relatively equal frequency on the head and neck, trunk, and upper and lower extremities.<ref name="Andrews" /><ref name="Bolognia" />
**Intermuscular lipoma
*'''Neural fibrolipomas''' are overgrowths of fibro-fatty tissue along a nerve trunk, which often leads to nerve compression.
**Lipomatosis of [[nerve]]
*'''Pleomorphic lipomas''', like spindle-cell lipomas, occur for the most part on the backs and necks of elderly men and are characterized by floret giant cells with overlapping nuclei.
**Lipoma of the [[tendon sheath]] and [[joint]]
*'''Spindle-cell lipomas''' are asymptomatic, slow-growing subcutaneous tumors that have a predilection for the posterior back, neck, and shoulders of older men.
*Infiltrating lipomas including
*'''Superficial subcutaneous lipomas''', the most common type of lipoma, lie just below the surface of the skin. Most occur on the [[Torso|trunk]], [[thigh]], and [[forearm]], although they may be found anywhere in the body where fat is located.
**Diffuse lipomatosis
 
**Symmetric lipomatosis
**Adiposis dolorosa
*Hibernoma
==References==
==References==
{{reflist|2}}
{{reflist|2}}

Latest revision as of 19:24, 8 November 2019

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Sahar Memar Montazerin, M.D.[2]

Overview

Lipoma may be classified into different subtypes depending on the classification system. They may be classified according to the anatomical location, the related tissues or other characteristics.

Classification

Lipomas can be classified according to their anatomical locations into:[1]

Another suggested classification is according to the related structure:

World health organization (WHO) classification system classified lipomatous tumors into the following sub types:[2]

Weiss and Goldblum classified Lipomatous tumors into the following subtypes. This classification system has shown more clinical utility.[3]

  • Lipoma which may be classified as superficial or deep, single or multiple
  • Variants of lipoma including:
    • Angiolipoma
    • Myolipoma
    • Chondroid lipoma
    • Lipoblastoma
    • Lpindle-cell/pleomorphic lipoma
  • Lipomatous tumors including:
  • Infiltrating lipomas including
    • Diffuse lipomatosis
    • Symmetric lipomatosis
    • Adiposis dolorosa
  • Hibernoma

References

  1. ↑ Al-Qattan, M. M.; Al-Lazzam, A. M.; Al Thunayan, A.; Al Namlah, A.; Mahmoud, S.; Hashem, F.; Tulbah, A. (2012). "CLASSIFICATION OF BENIGN FATTY TUMOURS OF THE UPPER LIMB". Hand Surgery. 10 (01): 43–59. doi:10.1142/S0218810405002541. ISSN 0218-8104.
  2. ↑ Bancroft, Laura W.; Kransdorf, Mark J.; Peterson, Jeffrey J.; O’Connor, Mary I. (2006). "Benign fatty tumors: classification, clinical course, imaging appearance, and treatment". Skeletal Radiology. 35 (10): 719–733. doi:10.1007/s00256-006-0189-y. ISSN 0364-2348.
  3. ↑ Goldblum, John (2014). Enzinger and Weiss's soft tissue tumors. Philadelphia, PA: Saunders/Elsevier. ISBN 9781455737635.


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