The twins -- Jagannath and Balram -- from Kandhamal district in Odisha, were taken to AIIMS after they were brought here from Bhubaneshwar this afternoon.
They are accompanied by their parents and Assistant Manager of National Adolescent Health Programme, Soumya Samantray.
Dr A K Mahapatra, chief of neuro sciences centre at AIIMS said the twins will undergo a series of tests such as MRI, CT scan, and angiogram, to see to what extent the veins in their brains are fused and whether surgery is feasible.
Dr Deepak Gupta, professor of neurosurgery, said the conjoined twins suffer from a rare condition which afflicts one in 30 lakh children, of which 50 per cent die either at birth or within 24 hours. Surgery is feasible only on 25 per cent of the survivors while the rest continue to live with the condition.
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Jagannath and Balram's parents, who are poor farmers, expressed the hope that doctors would perform the surgery and separate their sons.
"We have come all the way from Odisha with a hope that the lives of our children will be transformed after the surgery. The rest is up to god, we human beings can only hope for the best," their mother said.