UPDATED 7:24PM, MAR 15 2021
Altior has been ruled out of Wednesday's Grade 1 Betway Queen Mother Champion Chase at the eleventh hour after Nicky Henderson reported he returned an unsatisfactory scope on Monday morning.
The 11-year-old, who won in 2018 and 2019, was withdrawn on the morning of the race last year after failing to recover from a setback. Altior had been available at 6-1 generally for this year's running.
Speaking to the Racing Post, Henderson said: "It's very upsetting. At least he told us, which is something. If we'd run him, well, it just doesn't bear thinking about. We've got the figures back from the laboratory and they tell their own tale.