FACTBOX - Italy's CIA "kidnap" case

(Reuters) - An Italian judge on Wednesday could decide to call Prime Minister Silvio Berlusconi to testify in a trial against U.S. and Italian spies accused of kidnapping a terrorism suspect in Milan in 2003.

Following are details of the case, the first criminal trial over "renditions," one of the most controversial aspects of U.S. President George W. Bush's war on terrorism.

WHO ARE THE SUSPECTS?

Twenty-six Americans including former CIA station chiefs in Rome and Milan, Jeff Castelli and Robert Lady, and the head of security at the U.S. air base in Aviano in northern Italy.

Seven Italians also face charges, including Italy's former spy chief Nicolo Pollari.

WHAT ARE THE ACCUSATIONS?

That a CIA-led team grabbed Hassan Mustafa Osama Nasr, a Muslim cleric also known as Abu Omar, in Milan on February 17 2003, flew him via Germany to Egypt, where Nasr says he was tortured with electric shocks, beatings, rape threats and genital abuse.

Nasr was released from jail in Egypt last year and lives in Alexandria.

WHY BERLUSCONI? WHO ELSE COULD TESTIFY?