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Undifferentiated pleomorphic sarcoma (UPS), also termed pleomorphic myofibrosarcoma, [1] high-grade myofibroblastic sarcoma, and high-grade myofibrosarcoma, [2] is characterized by the World Health Organization (WHO) as a rare, poorly differentiated neoplasm (i.e., an abnormal growth of cells that have an unclear identity and/or cell of origin). [3]
As a novel form of treatment used in other cancers, immunotherapy may have a role in treating soft-tissue sarcomas like alveolar soft part sarcoma and pleomorphic undifferentiated sarcoma. However, as of 2023, only alveolar soft part sarcoma has a regulatory approval for such an agent, in this case atezolizumab. [19]
Soft tissue sarcomas are often detected as a firm mass located on the trunk, limbs, or oral cavity. The symptoms depend on the tumor's location and degree of invasion. For example, tumors in the gastrointestinal tract may cause vomiting, diarrhea, or weight loss. Tumors in the mouth may cause bad breath, difficulty swallowing, or lack of appetite.
Myofibroblastic sarcomas had been divided into low-grade myofibroblastic sarcomas, intermediate‐grade myofibroblasic sarcomas, i.e. IGMS, and high‐grade myofibroblasic sarcomas, i.e. HGMS (also termed undifferentiated pleomorphic sarcoma and pleomorphic myofibrosarcoma [and formerly termed malignant fibrous histiocytoma [3]]) based on their ...
Pleomorphic rhabdomyosarcoma (undifferentiated rhabdomyosarcoma), also known as anaplastic rhabdomyosarcoma, is defined by the presence of pleomorphic cells with large, lobate hyperchromatic nuclei and multipolar mitotic figures. These tumors display high heterogeneity and extremely poor differentiation.
A sarcoma is a malignant tumor, a type of cancer that arises from cells of mesenchymal (connective tissue) origin. [1] [2] Connective tissue is a broad term that includes bone, cartilage, muscle, fat, vascular, or other structural tissues, and sarcomas can arise in any of these types of tissues.
The histopathological appearance of DDL tumors (see Fig. 2 in the below Histopathology of liposarcomas section) varies widely but most frequently exhibits features of undifferentiated pleomorphic sarcomas (which are tumors densely populated with variably sized and shaped cells containing variability sized and shaped nuclei) or spindle cell ...
176 Kaposi's sarcoma. 176.0 Kaposi's sarcoma skin; 176.1 Kaposi's sarcoma soft tissue; 176.2 Kaposi's sarcoma palate; 176.3 Kaposi's sarcoma gastrointestinal sites; 176.4 Kaposi's sarcoma; 176.5 Kaposi's sarcoma lymph nodes; 176.8 Kaposi's sarcoma other specified sites; 176.9 Kaposi's sarcoma unspecified site
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