Source:http://linkedlifedata.com/resource/umls/id/C1333400
NCI: An enhancing lesion is a well-demarcated area of unequivocally increased signal intensity on T1-weighted spin-echo (SE) images compared with normal-appearing, surrounding tissue following intravenous injection of a gadolinium chelate. (from http://cni.bwh.harvard.edu/projects/gdc/gdc_MRcriteria.html)