tubal reversal operation makes use of microsurgery to rejoin the sections of the fallopian tubes. Some factors play an important role on the potential for a successful tube reversal operation. Because the diameter of the fallopian tube differs from one end to the other, a better chance for positive results occurs when the diameters of the remaining two ends of fallopian tube are about identical. In situations where the two remaining ends of the fallopian tubes are of different diameters (for instance, a smaller end of tube close to the uterus is being connected to a wider end near the end of the fallopian tube), success rates for getting pregnant are poorer.