Japanese Emperor Akihito, who underwent heart bypass surgery in February, will have fluid extracted from his chest for the second time, the palace said Monday.
The treatment will be conducted at the Imperial Household Hospital in the palace grounds on Tuesday morning, the agency said, DPA reported.
The 78-year-old emperor received a similar procedure on March 7. He was discharged from hospital on March 4 after the surgery, the first since 2003, when he underwent surgery for prostate cancer.
Akihito, who ascended the throne in 1989 after the death of his father, Hirohito, was hospitalized in November for more than two weeks due to persistent fever and a severe case of bronchitis.