The man convicted of the 1988 Lockerbie aircraft bombing is battling advanced prostate cancer.
Abdelbaset Ali Mohmed Al Megrahi was diagnosed with prostate cancer after hospital tests last month and the disease has spread to other parts of his body, his solicitor Tony Kelly said.
The former Libyan intelligence agent, who is 56, is serving a life sentence with a minimum term of 27 years for the bombing of Pan Am flight 103 in 1988 which led to the deaths of 270 people.
He was taken from his prison cell in HMP Greenock under tight security to undergo hospital tests at Inverclyde Royal Hospital in Greenock last month.
It is understood he underwent a scan during an outpatient appointment before being returned to jail.
Al Megrahi was convicted of the Lockerbie bombing in 2001.
He lost an appeal in 2002, but was given a fresh chance to clear his name in June last year when the Scottish Criminal Cases Review Commission referred his case back to appeal judges for a second time.
Mr Kelly said the appeal process would continue.
