Mary Clancey of Saint Clair, Pennsylvania had struggled with weight issues for most of her adult life. Even though she took care with diet and exercise, the 71-year-old grandmother's weight would not budge below 350 pounds.

Then, one day, she shed nearly 200 pounds in 24 hours.

All her life, she thought she was just a "plump woman," when in fact, she was carrying a tumor the size of a person growing in her midsection.

Philadelphia news station 6ABC Action News reports that she visited the hospital after experiencing blood clotting in her legs. That's where an MRI revealed a large mass on her ovary.

Doctors suspect that the tumor had been growing for nearly 16 years! It took them five hours to remove the 140-pound stage-one cancerous tumor and 40 pounds of extra skin!

Clancey went from 350lbs to a slim and trim 150lbs!

Although it's taken some getting used to, Clancey is enjoying her newfound physical freedom:

"My body didn't feel right. I guess I was so used to carrying that weight that I felt totally different." She tells local news, "I gained 10 pounds since I got home," she said, "hopefully, I'll get curvy. I'll be one hot babe eventually."

Mary, you already are!