Tymoshenko arrived in the German capital last night and immediately checked into the Charite, one of Europe's largest hospitals, where doctors performed scans on her back.
"We can't say how long she will have to stay here. That depends on what therapeutic path is taken," said Dr Karl Max Einhaeupl, the hospital's chief executive, who visited Tymoshenko during her 2 1/2 years in jail on charges of abuse of office. She was released two weeks ago after the ouster of pro-Russian President Viktor Yanukovych.
If Tymoshenko does have an operation, a routine procedure that can be done in under an hour, the recovery would typically last about four days followed by rehabilitation over several weeks, he said.
Tymoshenko refused to receive invasive medical treatment while in prison, fearing that political opponents might seek to injure her further.
Also Read
One common treatment for her condition, known as infiltration, involves injecting painkillers and anti-inflammatory drugs into the site of the slipped disc.
In her public appearances in recent days Tymoshenko looked much better than she did immediately after her release, when she appeared on a stage in central Kiev in a wheelchair looking pale and worn out.
Dr Anett Reisshauer, who oversees rehabilitation at the Charite, said Tymoshenko's improvement reflected the relief of freedom. Stress can impair the back muscles, which in turn affects the spine, she said.