Liposarcoma pathophysiology: Difference between revisions
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According to the WHO classification described previously, well differentiated liposarcomas may be sub-classified into 3 types: ''sclerosing''; ''adipocytic''; and ''inflammatory''. | According to the WHO classification described previously, well differentiated liposarcomas may be sub-classified into 3 types: ''sclerosing''; ''adipocytic''; and ''inflammatory''. | ||
====Sclerosing Liposarcoma==== | ====Sclerosing Liposarcoma==== | ||
Occurs most frequently at the retroperitoneum and paratesticular regions. | Occurs most frequently at the retroperitoneum and paratesticular regions. The particular [[histological]] finding in this type of well differentiated liposarcoma is the identification of distinctive [[stromal]] cells distributed across the tissue, and associated with lipoblasts filled with multiple [[vacuoles]]. This association forms a [[collagenous]] background of fibrillary appearance. In certain cases the fibrous component of the [[neoplasm]] may occupy most of its mass.<ref name="pmid10982304">{{cite journal| author=Dei Tos AP| title=Liposarcoma: new entities and evolving concepts. | journal=Ann Diagn Pathol | year= 2000 | volume= 4 | issue= 4 | pages= 252-66 | pmid=10982304 | doi=10.1053/adpa.2000.8133 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10982304 }} </ref> | ||
====Adipocytic Liposarcoma==== | ====Adipocytic Liposarcoma==== | ||
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Adipocytic liposar- coma is mostly composed of mature adipocytes exhibit- ing striking variation in cell size and at least focal nuclear atypia and hyperchromasia (Fig 1). Scattered hyperchromatic stromal cells may be encountered within fibrous septa. Of course, a varying number (from many to none) of monovacuolated or multivacuolated lipo- blasts (defined by the presence of single or multiple sharply marginated cytoplasmic vacuoles that indent an enlarged hyperchromatic nucleus) may be found (Fig 2). It is a commonly held opinion that lipoblasts represent the hallmark for any type of malignant adipocytic lesion. | Adipocytic liposar- coma is mostly composed of mature adipocytes exhibit- ing striking variation in cell size and at least focal nuclear atypia and hyperchromasia (Fig 1). Scattered hyperchromatic stromal cells may be encountered within fibrous septa. Of course, a varying number (from many to none) of monovacuolated or multivacuolated lipo- blasts (defined by the presence of single or multiple sharply marginated cytoplasmic vacuoles that indent an enlarged hyperchromatic nucleus) may be found (Fig 2). It is a commonly held opinion that lipoblasts represent the hallmark for any type of malignant adipocytic lesion. | ||
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==Microscopic Pathology== | ==Microscopic Pathology== | ||
==References== | ==References== | ||
Revision as of 15:26, 19 September 2014
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Liposarcoma Microchapters |
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Diagnosis |
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Treatment |
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Liposarcoma pathophysiology On the Web |
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American Roentgen Ray Society Images of Liposarcoma pathophysiology |
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Risk calculators and risk factors for Liposarcoma pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: João André Alves Silva, M.D. [2]
Overview
Pathogenesis
According to their class, each liposarcoma will have specific characteristics and pathogenesis:
Well Differentiated Liposarcoma
This type of liposarcoma occurs both at the limbs and retroperitoneum in equal frequency, and occasionally at the mediastinum and spermatic cord, representing about 45% of liposarcomas.[1]
According to the WHO classification described previously, well differentiated liposarcomas may be sub-classified into 3 types: sclerosing; adipocytic; and inflammatory.
Sclerosing Liposarcoma
Occurs most frequently at the retroperitoneum and paratesticular regions. The particular histological finding in this type of well differentiated liposarcoma is the identification of distinctive stromal cells distributed across the tissue, and associated with lipoblasts filled with multiple vacuoles. This association forms a collagenous background of fibrillary appearance. In certain cases the fibrous component of the neoplasm may occupy most of its mass.[1]
Adipocytic Liposarcoma
Inflammatory Liposarcoma
Dedifferentiated Liposarcoma
Myxoid Liposarcoma
Round Cell Liposarcoma
Pleomorphic Liposarcoma
Genetics
Associated Conditions
Gross Pathology
Microscopic Pathology
References
- ↑ 1.0 1.1 Dei Tos AP (2000). "Liposarcoma: new entities and evolving concepts". Ann Diagn Pathol. 4 (4): 252–66. doi:10.1053/adpa.2000.8133. PMID 10982304.