Nicky Henderson has revealed Shishkin has been found to be suffering from a “pretty rare bone condition” following his disappointing performance in the Queen Mother Champion Chase at Cheltenham.
Unbeaten in seven previous starts over fences, the eight-year-old was a hot favourite to claim a third Festival victory in last month’s day two feature.
But the writing was on the wall for his supporters from an early stage, with Nico de Boinville giving up the ghost and pulling up Shishkin in the back straight.