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.