Actress Suzanne Pleshette was undergoing chemotherapy for lung cancer that was caught at an early stage, her agent said Friday.

The cancer, discovered during a routine X-ray, is the size of "a grain of sand and was caught very much in time," said agent Joel Dean. "She feels very lucky. ...She's not concerned and in great spirits."

Pleshette, 69, was receiving chemotherapy as an outpatient at Cedars-Sinai Medical Center, where the cancer was diagnosed, he said.

The actress is best known for her role in "The Bob Newhart Show," the 1970s Newhart comedy in which she played his sardonic wife, Emily. Her extensive TV credits include "8 Simple Rules" and Karen's mom on "Will & Grace," and her throaty voice has been heard in "Spirited Away" and other recent animated films.

"If It's Tuesday This Must Be Belgium" and "Oh God! Book II" are among her films.

Pleshette and Tom Poston, 84, who costarred with her on "The Bob Newhart Show," were married in 2001.