Contrast-Enhanced Ultrasound Identification of Sentinel Nodes in Esophageal Cancer

This pilot trial studies how well an ultrasound with a contrast agent (perflubutane microbubble \[Sonazoid\]) works in identifying sentinel lymph nodes in participants with esophageal cancer. Sentinel lymph nodes are lymph nodes to which the cancer is likely to spread from the primary tumor. Diagnostic procedures, such as contrast-enhanced ultrasound, may work better in identifying sentinel lymph nodes and finding out how far the disease has spread.