Photo taken January 2016 shows Princess Nobuko, widow of Prince Tomohito of Mikasa. (Kyodo)

Princess Nobuko, widow of Prince Tomohito of Mikasa, has been diagnosed with early-stage breast cancer and is scheduled to undergo surgery this weekend, the Imperial Household Agency said Tuesday.

The 67-year-old princess will be admitted to Keio University Hospital in Tokyo on Wednesday, with the operation to be performed on Saturday, according to the agency.

The princess underwent a MRI and biopsy when she was hospitalized at the hospital on Nov. 4 for a follow-up examination of a lumbar vertebrae fractured in 2019, the agency said.

She was diagnosed with cancer of the right breast last Friday, but has no noticeable symptoms, it added.

The princess is a granddaughter of the late Prime Minister Shigeru Yoshida and former Prime Minister Taro Aso's younger sister. Her late husband Prince Tomohito of Mikasa was a cousin of former Emperor Akihito.