It was announced last week that the NBC series Parenthood would be delayed for eight weeks because actress Maura Tierney was suddenly unavailable because of a personal matter.  That has since changed and the celeb has pulled out of the television project completely.

Tierney had an operation to remove a breast tumor that was recently discovered.  Her doctors have assured her that her condition is very treatable and they expect a good outcome.  Tierney admits, “I will not know either my exact diagnosis or course of treatment until that surgery is performed.”

NBC will premiere a medical drama Mercy in the fall, as a replacement.  Tierney, who only filmed a pilot,  has decided to bow out of the show and her part will be recast and filming can resume.

View more photos below.

Photos:  WENN

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