Maura Tierney to Undergo Breast Tumor Surgery

Maura Tierney is having surgery to remove a breast tumor, she said in a statement to TVGuide.com.

The surgery is the reason NBC is delaying production on her new series, Parenthood, by eight weeks.

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"I have discovered a tumor in my breast which requires surgery," the actress, 44, said. "I will not know either my exact diagnosis or

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