On Monday, former ER star Maura Tierney revealed that will be undergoing surgery to remove a tumor from her breast.

“In an effort to guard my privacy, it seems that the wording of NBC’s press release has unfortunately caused some confusion and undue alarm about my health,” the 44-year-old actress said in an statement.

“I have discovered a tumor in my breast which requires surgery. I will not know either my exact diagnosis or course of treatment until that surgery is performed. My doctors have all assured me this is a very treatable condition,” the statement read. “I’m very optimistic as to the outcome and want to thank everyone who has sent positive thoughts and support. I look forward to going back to work soon.”

On Friday, NBC Universal announced that they would be delaying production on Maura’s new series, Parenthood, but refused to specify what lead to the postponement. The show, based on 1989 film of the same name, centers around four siblings and their parents.