Liposarcoma pathophysiology: Difference between revisions
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====Sclerosing Liposarcoma==== | ====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.<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> | 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==== | |||
Frequently composed by [[adipocytes]] with different cell sizes, hyperchromasia and nuclear atypia. [[Fibrous]] septa may be identified among [[adipocytes]], containing hyperchromatic [[stromal cells]]. | |||
====Inflammatory Liposarcoma==== | ====Inflammatory Liposarcoma==== | ||
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However, it is important to emphasize that the mere presence of lipoblasts does not make (or is required for) a diagnosis of liposarcoma. As a matter of fact, there exist a number of entirely benign adipocytic lesions (eg, lipoblastoma, pleomorphic lipoma, chondroid lipoma) that may contain numerous lipoblasts. By contrast, the absence of lipoblasts within an adipocytic neoplasm fulfilling all the remaining diagnostic criteria for liposar- coma does not prevent such a diagnosis. | However, it is important to emphasize that the mere presence of lipoblasts does not make (or is required for) a diagnosis of liposarcoma. As a matter of fact, there exist a number of entirely benign adipocytic lesions (eg, lipoblastoma, pleomorphic lipoma, chondroid lipoma) that may contain numerous lipoblasts. By contrast, the absence of lipoblasts within an adipocytic neoplasm fulfilling all the remaining diagnostic criteria for liposar- coma does not prevent such a diagnosis. | ||
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Liposarcoma Microchapters |
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Liposarcoma pathophysiology On the Web |
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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
Frequently composed by adipocytes with different cell sizes, hyperchromasia and nuclear atypia. Fibrous septa may be identified among adipocytes, containing hyperchromatic stromal cells.
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.