The surgery was successful.
However, tests after the operation found cancer had been present.
In terms of the modern royals, they tend to march in step with shifting British attitudes around illnesses.
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But at the time doctors often withheld a serious cancer diagnosis.
Her condition was kept hidden on both occasions.
Even today the details of her cancer are unclear because she wished to keep it private, shares Russell.
Non-senior members of the royal family have often been more open about their health battles, however.
Were any of the senior royals to be absent without explanation, there would be justifiable concern.
As Kate said in the conclusion of her video message, You are not alone.
