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Epitheloide, biphasische und Mischtumoren des Weichgewebes

Epithelioid, biphasic and mixed tumors of soft tissue

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Zusammenfassung

Epitheloide Weichgewebstumoren bestehen ausschließlich aus epitheloiden Tumorzellen. Biphasische Tumoren sind hingegen aus einer spindelzelligen und einer epitheloiden Komponente aufgebaut. Die seltenen Mischtumoren des Weichgewebes zeigen eine breitere Vielfalt der zellulären und Stromadifferenzierung, besitzen aber auch wenigstens eine, ggf. mehrere epitheloide Anteile.

Aufgrund der verblüffenden Ähnlichkeit mancher Entitäten untereinander und gegenüber den häufigeren Metastasen im Weichgewebe von Karzinomen, Karzinosarkomen und Melanomen, dem Mesotheliom oder bestimmten Lymphomen ist die Diagnostik oft ausgesprochen schwierig. Der Nachweis bestimmter molekularer Veränderungen (meist chromosomale Translokationen) hat zu Änderungen in der Tumorklassifikation, aber auch viel zur verbesserten pathologischen Diagnostik (z. B. durch Entwicklung potenter diagnostischer Antikörper) und zum biologischen Verständnis beigetragen.

Diese Übersicht soll dem Pathologen aus Sicht der morphologischen Mustererkennung eine Hilfestellung zur Diagnostik dieser seltenen Tumoren dienen. Die wichtigsten Entitäten werden ausführlicher besprochen und abgebildet, wobei stets auch neueste immunhistochemische und molekulare Aspekte einfließen und die Differenzialdiagnose zu ähnlichen Tumoren gewürdigt wird.

Abstract

Epithelioid soft tissue tumors consist exclusively of epithelioid tumor cells. Biphasic tumors are composed of both a spindle-cell and an epithelioid component. The rare mixed tumors of soft tissue show a broader variety of cellular and stromal differentiation but also include at least one, possibly several, epithelioid portions.

The close morphological similarity of some of these entities with each other, as well as with the more frequent soft tissue metastases of carcinomas, carcinosarcomas, and melanomas, to malignant mesothelioma and certain lymphomas, can often make the correct diagnosis extremely difficult. Recent advances in the detection of certain molecular alterations (mostly chromosomal translocations) have contributed to changes in tumor classification but also to improved pathological diagnostics (e.g. through the development of potent diagnostic antibodies) and biological understanding.

The present overview should help the pathologist in the diagnosis of these rare tumors through the classical approach of morphological pattern recognition. The most important entities are discussed and illustrated in more detail, with the incorporation of the latest immunohistochemical and molecular aspects and the differential diagnosis of similar tumors.

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Abbreviations

AFH:

Angiomatoides fibröses Histiozytom

AWS:

Alveoläres Weichteilsarkom

BSS:

Biphänotypisches sinunasales Sarkom

CK:

Zytokeratin

dES:

Distales epitheloides Sarkom

EMA:

Epitheliales Membranantigen

EMC:

Extraskelettales myxoides Chondrosarkom

ES:

Epitheloides Sarkom

FISH:

Fluoreszenz-in-situ-Hybridisierung

HPF:

„High-power field“ (Hauptgesichtsfeld)

KZS:

Klarzellsarkom

lg-FMS:

Low-grade fibromyxoides Sarkom

ME:

Myoepitheliom

MEC:

Myoepitheliales Karzinom

MPNST:

Maligner peripherer Nervenscheidentumor

mRT:

Maligner Rhabdoidtumor

NOS:

„Not otherwise specified“ (nicht weiter spezifizierbar)

OFMT:

Ossifizierender fibromyxoider Tumor

PECom:

Tumor mit perivaskulärer Epitheloidzelldifferenzierung

pES:

Proximales epitheloides Sarkom

SEF:

Sklerosierendes epitheloides Fibroarkom

SS:

Synoviales Sarkom

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Correspondence to M. Evert.

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M. Evert und H.-U. Schildhaus geben an, dass kein Interessenkonflikt besteht.

Für diesen Beitrag wurden von den Autoren keine Studien an Menschen oder Tieren durchgeführt. Für die aufgeführten Studien gelten die jeweils dort angegebenen ethischen Richtlinien.

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H. A. Baba, Essen

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Evert, M., Schildhaus, HU. Epitheloide, biphasische und Mischtumoren des Weichgewebes. Pathologe 40, 393–411 (2019). https://doi.org/10.1007/s00292-019-0627-y

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