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The ease with which the base of the female bladder can be transilluminated prompts me to call attention to the method. With an electrically lighted cystoscope in the fluid filled bladder, the perineum is retracted with a Sims speculum, and the room is darkened. The lamp is carried close to the base of the bladder, and therefore an instrument of the "convex" type is preferable; but if one also wishes to palpate the structures between the beak of the cystoscope, using it as a sound, and a finger in the vagina, then the "concave" cystoscope should be selected.
The procedure has occasionally been found helpful: (a) in orientation, for example, by easily locating on one side of the septum a point readily visible on the other side, such as the orifice of a small vesicovaginal fistula; and (b) in seeing the relative thickness of the intervening tissues, for example, in
Laws GM. TRANSILLUMINATION OF THE VESICOVAGINAL SEPTUM. JAMA. 1924;82(12):965. doi:10.1001/jama.1924.26520380003012c
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