A woman in her 70s underwent surgery for a brain tumor at a hospital in Kyoto City. She claims brain tissue that was not a tumor was mistakenly removed, resulting in numbness.

The lawsuit seeks more than 28 million yen in damages from the doctor who performed the surgery and the Japanese Red Cross Society, which operates the hospital. The hospital has submitted a document admitting the mistake, but the relationship between the woman's symptoms and the mistake will be disputed in court, the hospital says. The woman's case is one of three in which the hospital issued administrative guidance in January.