Valladolid, Spain  - Lance Armstrong broke his right collarbone when he fell Monday in the first stage of the Vuelta of Castilla and Leon cycling race, the race's organizers confirmed.

The US cycling legend, 37, underwent tests at the Hospital Clinico in the northwestern Spanish city of Valladolid, but was set to leave hospital later Monday, after receiving treatment and painkillers to alleviate his condition, organizers added.

Armstrong - the winner of a record seven editions of the Tour de France - withdrew from the race some 20 kilometres before the stage finish in Baltanas, after being involved in a multiple fall. (dpa)