Difference between revisions of "Lipomatous tumor"

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File:Histopathology of a fibrolipoma.jpg|'''Fibrolipoma''' is a lipoma with focal areas of large amounts of fibrous tissue.<br>A '''sclerotic lipoma''' is one step further: a predominantly fibrous lesion with focal areas of fat.<ref>{{cite web|url=http://surgpathcriteria.stanford.edu/softfat/lipoma/fibrolipoma.html|title=Lipoma Variant: Fibrolipoma|website=Stanford University School of Medicine|accessdate=2020-02-10}}</ref><br>If unsure of degree of fibrosis: Simply report as lipoma.
 
File:Histopathology of a fibrolipoma.jpg|'''Fibrolipoma''' is a lipoma with focal areas of large amounts of fibrous tissue.<br>A '''sclerotic lipoma''' is one step further: a predominantly fibrous lesion with focal areas of fat.<ref>{{cite web|url=http://surgpathcriteria.stanford.edu/softfat/lipoma/fibrolipoma.html|title=Lipoma Variant: Fibrolipoma|website=Stanford University School of Medicine|accessdate=2020-02-10}}</ref><br>If unsure of degree of fibrosis: Simply report as lipoma.
 
File:Myxoid liposarcoma (16105753363).jpg|'''Myxoid liposarcoma''': Hypercellular solid sheets of cells lying back to back, with round cells or primitive cytomorphology.<ref>{{cite web|url=http://www.pathologyoutlines.com/topic/softtissuemyxoidliposarcoma.html|title=Soft tissue - Adipose tissue - Myxoid liposarcoma|author=Michael R. Clay|website=PathologyOutlines}} Topic Completed: 1 January 2018. Revised: 20 March 2019</ref>
 
File:Myxoid liposarcoma (16105753363).jpg|'''Myxoid liposarcoma''': Hypercellular solid sheets of cells lying back to back, with round cells or primitive cytomorphology.<ref>{{cite web|url=http://www.pathologyoutlines.com/topic/softtissuemyxoidliposarcoma.html|title=Soft tissue - Adipose tissue - Myxoid liposarcoma|author=Michael R. Clay|website=PathologyOutlines}} Topic Completed: 1 January 2018. Revised: 20 March 2019</ref>
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A '''pedunculated''' lipomatous skin tumor may be a '''pedunculated lipofibroma''':
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File:Pedunculated lipofibroma, gross pathology.jpg|Pedunculated lipofibroma, gross pathology
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File:Pedunculated lipofibroma (intermediate magnification).jpg|Histopathology, showing dermal lipocytes without capsule.
 
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===Microscopy/Histopathology report===
 
===Microscopy/Histopathology report===

Revision as of 11:40, 27 February 2020

Author: Mikael Häggström [note 1]

Lipomatous tumor.

Fixation

Generally 10% neutral buffered formalin.

  See also: General notes on fixation


Gross processing

  • Perform consecutive slicing of the entire specimen.
  • Look for signs of liposarcoma: Mainly by firm volumes.[1] Color varies from yellow to white (and firm) depending on the proportion of adipocytic, fibrous and/or myxoid content.[2] Areas of fat necrosis are common in larger lesions. Rarely, infiltrative growth is seen.[2]
  • Submit slices from any suspicious parts, or at least one representative slice from the specimen.

Gross report

  • Color
  • Even absence of hemorrhage or necrosis.

Example:

Mass weighing 121 grams and measuring 10 x 6,5 x 3,5 cm. Homogenous yellow color. No hemorrhage or necrosis.

  See also: General notes on gross processing


Microscopic evaluation

A pedunculated lipomatous skin tumor may be a pedunculated lipofibroma:

Microscopy/Histopathology report

For lipomas: Absence of signs of malignancy.

Histopathology of lipoma.jpg

Tissue composed of univacuolar fat cells and delicate and inconspicuous fibrous septa. No evidence of malignancy.

  See also: General notes on reporting


Notes

  1. For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Patholines:Authorship for details.

Main page

References

  1. Monica Dahlgren, Janne Malina, Anna Måsbäck, Otto Ljungberg (1997-02-13). Lilla utskärningen.
  2. 2.0 2.1 Andreas F Mavrogenis, Panayiotis J Papagelopoulos (2013-02-01). Soft Tissues: Well-differentiated liposarcoma. Atlas of Genetics and Cytogenetics in Oncology and Haematology.
  3. . Lipoma Variant: Fibrolipoma. Stanford University School of Medicine. Retrieved on 2020-02-10.
  4. Michael R. Clay. Soft tissue - Adipose tissue - Myxoid liposarcoma. PathologyOutlines. Topic Completed: 1 January 2018. Revised: 20 March 2019

Image sources