What is the primary or most common caval neoplasm of the inferior vena cava?

What is the primary or most common caval neoplasm of the inferior vena cava?

• A. Renal cell carcinoma
• B. Leiomyosarcoma
• C. Hepatocellular carcinoma
• D. Angiosarcoma

Answer: (B)

The most common tumor that originates in the inferior vena cava itself is leiomyosarcoma. It arises from the smooth muscle cells of the vessel wall, so it represents a primary caval neoplasm rather than a mass that extends into the IVC from another organ. While renal cell carcinoma or hepatocellular carcinoma can invade the IVC by tumor thrombus, they originate in the kidney or liver, respectively, not in the IVC. Angiosarcoma is possible but far rarer than leiomyosarcoma. On imaging, leiomyosarcoma often appears as a mass arising from or extending along the wall of the IVC, sometimes intraluminally and potentially extending toward the hepatic veins or right atrium.

The most common tumor that originates in the inferior vena cava itself is leiomyosarcoma. It arises from the smooth muscle cells of the vessel wall, so it represents a primary caval neoplasm rather than a mass that extends into the IVC from another organ. While renal cell carcinoma or hepatocellular carcinoma can invade the IVC by tumor thrombus, they originate in the kidney or liver, respectively, not in the IVC. Angiosarcoma is possible but far rarer than leiomyosarcoma. On imaging, leiomyosarcoma often appears as a mass arising from or extending along the wall of the IVC, sometimes intraluminally and potentially extending toward the hepatic veins or right atrium.