Princess Yuriko is seen at the Toshimagaoka Cemetery in Tokyo after attending a memorial ceremony for her son Prince Tomohito of Mikasa on June 6, 2017, the fifth anniversary of his death. (Kyodo)

TOKYO - Princess Yuriko, the oldest member of Japan's imperial family and great-aunt of Emperor Naruhito, was discharged from hospital on Thursday after being diagnosed with heart failure and pneumonia, the Imperial Household Agency said.