Aides: Chavez in tough fight, may miss swearing-in - Article Photos 1/5

A person holds an image of the Venezuelan saint Jose Gregorio Hernadez as people gather to pray for Venezuela's President Hugo Chavez at the Simon Bolivar square in Caracas, Venezuela, Tuesday, Dec. 11, 2012. Doctors began operating on Chavez in Cuba, his government said, after his cancer reappeared despite a year and a half of surgeries and treatments. (AP Photo/Fernando Llano)