Shari Redstone, chair of Paramount Global, has been diagnosed with thyroid cancer, a spokesperson for Redstone confirmed Thursday.

"Shari Redstone was diagnosed with thyroid cancer earlier this spring," the spokesperson said in a statement to CBS News. "While it has been a challenging period, she is maintaining all professional and philanthropic activities throughout her treatment, which is ongoing. She and her family are grateful that her prognosis is excellent."

No further details were immediately provided. The 71-year-old Redstone is the non-executive chair of the Paramount Board of Directors and the controlling shareholder of National Amusements, Paramount Global's parent company. Paramount Global is the parent company of CBS News.

Redstone inherited Paramount from her father, the

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