Polanski won an Oscar for The Pianist in 2002
Director Roman Polanski, who has been held in a Swiss jail since September pending possible extradition charges, has been moved for medical tests.
His French lawyer Herve Temine told the Reuters news agency Polanski had been "taken from prison for medical attention. I don't know where he is."
He added he did not know when the film-maker, 76, would return to prison.
Polanski was arrested in Switzerland last month over his 1977 conviction for unlawful sex with a 13-year-old girl.
He left the US in 1978 before he could be sentenced and has never returned.
Mr Temine said Polanski was depressed and tired when he visited him in prison last week.
The director was arrested when he arrived in Switzerland on 26 September to collect a lifetime achievement award at a film festival.
US authorities have up to 60 days to make a firm extradition request.
Folco Galli, spokesman for Switzerland's Federal Office of Justice, declined to comment on whether Polanski had been moved to hospital or on the state of his health.