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Transillumination - Results

Normal Values:

Normal findings depend on the area being evaluated, and the normal tissue of that region.

What abnormal results mean:

Areas filled with abnormal air or fluid will light up when they should not. For example, in a darkened room, the head of a newborn with possible hydrocephalus will light up when this procedure is done.

When done on the breast:

  • Internal areas will be dark to black if there is a lesion and bleeding has occurred (because blood does not transilluminate).
  • Benign tumors tend to appear red.
  • Malignant tumors are brown to black.
  • Reviewed last on: 11/14/2007
  • Deirdre O’Reilly, M.D., M.P.H., Neonatologist, Division of Newborn Medicine, Children’s Hospital Boston and Instructor in Pediatrics, Harvard Medical School, Boston, Massachusetts.