Singapore doctors have successfully removed a two-kilogram (4.4-pound) tumour from an Indonesian boy’s neck and chest, a member of the surgical team said. Lukas Wahangara, who turned 13 on Wednesday, is recuperating well after the rare operation to remove the thyroid tumour measuring 20 centimetres (eight inches) in diameter, almost as big as an adult human’s head."He is doing very well and started speaking yesterday,” said Goh Yau Hong, one of six surgeons who carried out the 10-hour operation on November 28 at the private Mount Elizabeth Hospital in downtown Singapore.Details of the operation were made public Wednesday in the Singapore media.