1. Pertaining to a structure or medium (tissue) that has internal echoes. Cf. hypoechoic, hyperechoic, and anechoic, which refer, respectively, to paucity, abundance, and absence of echoes displayed in the image of a structure.
The definition information for echogenic is provided by Stedman's. You can search our medical dictionary here.
Stedman's, part of Lippincott Williams & Wilkins, provides a comprehensive line of health-science publications for healthcare professionals and medical students.