On this day, 35 years ago, on May 18, 1990 (April 24, 1990, the first skull conjoined in the Soviet Union was successfully separated. On May 18, 1990, Viria and Vitalia successfully performed the first Siamese baby skull separation in the Soviet Union at the Brchenko Institute of Neurosurgery of the Soviet Academy of Medical Sciences in Moscow. The operation caused a sensation in the Soviet medical community. Twin sisters Viria and Vitalia from Lithuania weighed a combined 3.2 kilograms at birth. Their mother underwent a Caesarean section and they were born safely. The sisters, whose anterior skulls are connected together, cannot see each other and have great difficulty moving. Although the Creator forcibly "united them into one", they were very different in character. Vitalia was lively and active, while Vilia was weak and quiet. It was often when Vilia was already asleep, but Vitalia was playing mischievously and her actions were difficult to keep in tune. According to relevant data, skull conjoined twins account for about 2?% of all conjoined twins. So far, more than 80 such cases have been found in the world, and a total of 31 conjoined skull separations have been performed around the world. However, the risk of the operation is extremely high, and it is difficult for both twins to survive. The high-profile operation was the 32nd attempt in the world and the second in the Soviet Union (a skull conjoined detachment was performed in Leningrad more than 20 years ago, but it failed.) This operation is unprecedented in terms of the complexity of the technique and the results achieved. The latest research results in the field of neurosurgery were used in the operation. The biggest difficulty in the operation is how to accurately determine the brain dividing line of conjoined twins to ensure that no one of them is accidentally injured. Afterwards, Alexander Konovalov, an academician of the Soviet Academy of Medical Sciences, who presided over the operation, said: "The large connection of the brain of the two girls caused great difficulties in the operation. Even under the microscope, it was difficult to determine the brain of the two children. Line of demarcation." The doctors put in great efforts to make the operation a success. Current observations show that the operation has no damage to the brain function of the two girls. Their brain functions have developed well so far, but it is too early to make predictions about future development. The separated twin sisters will still have a difficult recovery period. They will also undergo plastic surgery. At the same time, the two sisters will interact with each other in a new way. This pair of girls who were connected not long ago, but now live separately. Psychological development can also cause some problems, requiring careful observation, treatment and careful care. The twin sister and father said hopefully: "I believe in the doctors and very much hope that everything will go smoothly in the future..." The separation operation was very successful. The doctor prepared for the operation