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However, the diagnosis of DDL is supported in individuals: whose tumors contain ALT/WDL admixed with DDL histological components; with histories of having a prior ALT/WDL; [8] or who present with a retroperitoneal liposarcoma (DDL constitutes ~57% of all retroperitoneal liposarcomas). DDL tumors only rarely (<1% of cases) present as superficial ...
Retroperitoneal fibrosis; Retroperitoneal lymph node dissection; It is also possible to have a neoplasm in this area, more commonly a metastasis; or very rarely a primary neoplasm. The most common type is a sarcoma followed by lymphoma, extragonadal germ cell tumor, and gastrointestinal stromal tumor/GIST. [9] Examples of tumors include:
A myxoid liposarcoma is a malignant adipose tissue neoplasm [1] of myxoid appearance histologically.. Myxoid liposarcomas are the second-most common type of liposarcoma, representing 30–40% of all liposarcomas in the limbs, occurring most commonly in the legs, particularly the thigh, followed by the buttocks, retroperitoneum, trunk, ankle, proximal limb girdle, head and neck, and wrist.
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]
Gallium scan showing panda (A) and lambda (B) patterns, considered specific for sarcoidosis in the absence of histological confirmation. In the past, the gallium scan was the gold standard for lymphoma staging, until it was replaced by positron emission tomography (PET) using 18 F-fluorodeoxyglucose (FDG).
Ganglioneuroma (occasionally called a "ganglioma") is a rare and benign tumor of the autonomic nerve fibers arising from neural crest sympathogonia (undifferentiated cells of the sympathetic nervous system). [1] However, ganglioneuromas themselves are fully differentiated neuronal tumors that do not contain immature elements. [2]
Desmoid tumors are a type of fibromatosis and related to sarcoma, though without the ability to spread throughout the body (metastasize). The tumors arise from cells called fibroblasts, which are found throughout the body and provide structural support, protection to the vital organs, and play a critical role in wound healing. These tumors tend ...
A malignant peripheral nerve sheath tumor (MPNST) is a form of cancer of the connective tissue surrounding peripheral nerves. Given its origin and behavior it is classified as a sarcoma . About half the cases are diagnosed in people with neurofibromatosis ; the lifetime risk for an MPNST in patients with neurofibromatosis type 1 is 8–13%. [ 2 ]