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This procedure is offered primarily as a means of diagnosing the condition of the glands of the cervix.
The cervix may be transilluminated by a light applied to the vaginal surface, or by a small light introduced within the cervical canal. A hooded light must be used when applied to the outer surface of the cervix, so that all the rays are directed into the cervical tissue. A Carroll antrum transilluminator, which has the light at right angles to a straight handle, serves well for this purpose. The position of the light and its intensity must be varied until just the proper illumination is secured. A light from a urethroscope may be used for the inside of the cervix.
The first cervix I examined this way had a definite cyst visible to ordinary examination. Transillumination revealed the cyst as an area more translucent than the rest of the cervix, and
Thompson LR. TRANSILLUMINATION OF THE CERVIX OF THE UTERUS. JAMA. 1926;86(19):1437. doi:10.1001/jama.1926.26720450002011a