Pulmonary Vein Leiomyosarcoma, also known as leiomyosarcoma of the pulmonary vein, is related to mesenchymal cell neoplasm and leiomyosarcoma. An important gene associated with Pulmonary Vein Leiomyosarcoma is CALD1 (Caldesmon 1), and among its related pathways/superpathways are Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell and Mesenchymal Stem Cells and Lineage-specific Markers. Affiliated tissues include heart and pulmonary vein.