MedGen

A type of sarcoma (A connective tissue neoplasm formed by proliferation of mesodermal cells) that develops from soft tissues like fat, muscle, nerves, fibrous tissues, blood vessels, or deep skin tissues. [from HPO]

A tumor (abnormal growth of tissue) that arises from the soft tissue. The most common types are lipomatous (fatty), vascular, smooth muscle, fibrous, and fibrohistiocytic neoplasms. [from HPO]

A connective tissue neoplasm formed by proliferation of mesodermal cells. Bone and soft tissue sarcomas are the main types of sarcoma. Sarcoma is usually highly malignant. [from HPO]

Rhabdoid tumors are rare aggressive malignancies in infants and young children with a poor prognosis. The most common anatomic localizations are the central nervous system, the kidneys, and other soft tissues. [from HPO]

A smooth muscle connective tissue tumor, which is rare type of cancer that is a malignant neoplasm of smooth muscle. When such a neoplasm is benign, it is called a leiomyoma. [from HPO]

A slowly growing malignant neoplasm derived from cartilage cells. [from HPO]

An epithelioid sarcoma predominantly involving the pelvis, perineum, and genital organs. It tends to have a more aggressive clinical course as compared to the more frequently seen distal-type epithelioid sarcoma. [from NCI]

Extraskeletal myxoid chondrosarcoma is a rare soft tissue neoplasm of chondroblastic origin. The tumors are most commonly found in middle-aged and elderly individuals, are more common among men, and are often detected as deep-seated lesions in the extremities. Despite their relatively low-grade malignancy, recurrence and metastasis may appear many years after the initial diagnosis. Histologic tissue section examination reveals a mixture of cellular and myxoid stromal components (Panagopoulos et al., 2002). [from OMIM]

Epithelioid sarcoma is a rare, soft tissue tumor characterized by high incidence of local recurrence, regional lymph node involvement and distant metastases. It commonly affects the soft tissue under the skin of a finger, hand, forearm, lower leg or foot, less often other areas of the body. [from ORDO]

A chondrosarcoma characterized by the presence of myxoid changes. [from MONDO]

Synovial sarcomas, which represent approximately 10% of all soft tissue sarcomas, are aggressive spindle cell sarcomas containing in some cases areas of epithelial differentiation. They consistently show a specific t(X;18)(p11.2;q11.2), which usually represents either of 2 gene fusions, SYT (600192)-SSX1 (312820) or SYT-SSX2 (300192), encoding putative transcriptional proteins differing at 13 amino acid positions (summary by Ladanyi et al., 2002). Synovial sarcoma, according to the experience of Enzinger and Weiss (1983), is the fourth most common type of soft tissue sarcoma. It usually develops in adolescents and young adults, is more common in males than in females, and has no racial predilection. [from OMIM]

Any structural anomaly of the synovium, which is a membrane that lines the cavity of synovial joints and consists of a lining layer of macrophage-like synoviocytes and fibroblast-like synoviocytes, as well as a sublining of connective tissue. Synovial cells are thought to contribute to joint homeostasis by secreting various factors such as hyaluronic acid and lubricin important for joint lubrication and function, as well as disposing of the waste products. [from HPO]

An abnormal count or structure of eosinophils. [from HPO]

A malignant neoplasm that affects the kidney and occurs in childhood. [from NCI]

A neurofibroma (benign peripheral nerve sheath tumor) localized adjacent to the spine. [from HPO]

A myxoid chondrosarcoma occurring in children. [from NCI]

A rhabdoid tumor which arises in the soft tissues. It occurs in infants and children and may be associated with loss of chromosome 22. It is characterized by the presence of cells with a large eccentric nucleus, prominent nucleolus, and abundant cytoplasm. [from NCI]

A highly aggressive, extremely rare neoplasm of the kidney that is usually seen in children. The term rhabdoid is used because the tumor cells resemble rhabdomyoblasts but lack myogenic markers, and pathologic diagnosis requires familiarity with these microscopic features plus awareness that adult onset is possible. It can be associated with abnormalities of chromosome 22. It is characterized by the presence of cells with a large eccentric nucleus, prominent nucleolus, and abundant cytoplasm. [from HPO]

A well-circumscribed, lobulated tumor, completely or partially covered by a fibrous capsule. It usually arises in the fingers. It is characterized by the presence of mononuclear cells, multinucleated osteoclast-like giant cells, hemosiderin-laden macrophages, foam cells, and an inflammatory infiltrate. The tumor is slow-growing, usually developing over several years. Clinical presentation includes painless edema of the affected site. [from NCI]

A synovial sarcoma characterized by the presence of an epithelial cell component only. The epithelial cells are arranged in glandular or papillary structures. [from NCI]