Westchester Medical Center Lung Cancer Center, located at 100 Woods Road in Valhalla, NY, provides lung cancer screening services and treatment for esophageal cancer, mesothelioma, thymoma/thymic cancer, and esophageal gastrointestinal stromal tumors (GIST). WMCHealth Cancer Institute is a member of the Westchester Medical Center Health Network (WMCHealth), a 1,700-bed healthcare system headquartered in Valhalla, New York, with nine hospitals on seven campuses spanning 6,200 square miles of the Hudson Valley.