This is a link to a java based UMLS visualizer. Your comments are most welcome. It takes 30-60 seconds to load when first invoked.
Instructions: Select the databases to search on the right. Type in a particular term at the bottom and press return. The seed term will remain in red, but attach to the inital term that is found. Click to expand each node. If you click and a node does not expand there are no more children for that particualr node.
Nicolaus Copernicus University
Cincinnati Children's Hospital Medical Center
University of Cincinnati