Transillumination is the shining of a bright light through a body cavity or organ for diagnostic purposes. Transillumination can be used on the head, scrotum, or chest in the premature or newborn infant, or the breast in an adult female.
Review Date 7/11/2019
Updated by: Michael M. Phillips, MD, Clinical Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.