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Published 16:46 24 Jan 2022 GMT
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Jenny first announced that doctors discovered the tumour earlier this month.
On Instagram, she said: "Some of you may already know that I had a brain tumour removed successfully in 2011 by an incredible person, Professor Ciarán Bolger at Beaumont Hospital.
"Unfortunately after a recent brain scan, it seems there is new activity. This means there is some "swollen tissue" which is probably a tumour growing back. Good news is, it's not malignant and Professor Bolger will need to carry out some brain surgery to remove it."
Jenny has also been extending her thanks to her followers for flooding her with support.
A few days after the initial health update, she said: "I'm, in good form, a bit emotional today reading all of your messages.
"I can't get back to every single person because I'd say there are a couple of thousand messages but I just wanted to come on myself to say thank you so much to each and every one of you."Celebrity