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The cause of an Atlanta woman's inexplicable weight gain has been identified and removed: a 27-pound tumor about the size of a beach ball in her belly, reports 11Alive. Doctors removed the cystic tumor this week from 59-year-old Doris Lewis in a delicate operation that lasted more than eight hours—delicate because the tumor was pressing against her stomach wall, her small intestine, and other organs, reports WSB-TV. Lewis says she initially dismissed her growing belly as routine weight gain, then delayed seeing a doctor because she lacked health insurance. She's expected to make a full recovery. (A woman in Brazil had a tumor more than three times larger.)