Preferred Label : Superior Vena Cava Leiomyosarcoma;
NCIt synonyms : Leiomyosarcoma of Superior Vena Cava; Leiomyosarcoma of the Superior Vena Cava;
NCIt definition : An aggressive malignant smooth muscle neoplasm, arising from the superior vena cava.
It is characterized by a proliferation of neoplastic spindle cells.;