Find Us Center for Head, Neck, and Skull BaseFind Us 333 Longwood Avenue, 3rd floor The Center for Head, Neck and Skullbase Tumors is located on the third floor of 333 Longwood Avenue, across the street from the main hospital. Exit the Patient and Family Garage onto Longwood Avenue and take a right. 333 Longwood is the second building on your right. Copyright © 2009 Children's Hospital Boston