Brazilian President Luiz Inacio Lula da Silva has canceled a trip to the United Nations COP16 summit in Colombia, his office said on Friday, following medical advice after he suffered a head injury last weekend.

BRASILIA (Reuters) - Brazilian President Luiz Inacio Lula da Silva underwent fresh medical exams on Friday, which showed he is in "stable" condition after suffering a head injury last weekend that forced him to cancel a trip to Russia.

Brazilian President Luiz Inacio Lula da Silva said the head injury he suffered from a fall at home over the weekend was "serious" and that doctors expect to have a clear view on its severity in three or four days,

Brazilian President Luiz Inacio Lula da Silva underwent new medical exams on Tuesday, which showed his condition is stable in comparison to previous assessments following a weekend head injury, his doctors said.