MedGen

A poorly circumscribed morphologic variant of rhabdomyosarcoma. It is characterized by the presence of primitive skeletal muscle differentiation in any stage of myogenesis. [from NCI]

A malignant soft tissue tumor which develops from cells of striated muscle. It is the most common form of tumor found in children and adolescents. [from ORDO]

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]

A benign, well circumscribed soft tissue neoplasm characterized by the presence of spindle shaped myofibroblasts and mast cells in a collagenous stroma. [from NCI]

The formation of new or recent blood vessels. The vasculature network is critical to the development of neoplasms. As the tumor burden grows, vascular endothelial cells are recruited to form new blood vessels as an increased demand for blood and nourishment is required. [from NCI]

A granular cell tumor characterized by the absence of atypical or malignant cytological and architectural features, and absence of invasive features or metastatic potential. [from NCI]

A malignant neoplasm affecting the skeletal or smooth muscles. Malignant neoplasms arising from the skeletal muscles are called rhabdomyosarcomas. Malignant neoplasms arising from the smooth muscles are called leiomyosarcomas. [from NCI]