Japan's emperor Akihito has been hospitalised for heart tests, reports say.
An officiial with Japan's Imperial Household Agency says the 78-year-old Akihito was admitted to University of Tokyo Hospital on Saturday for testing, but that the visit was not an emergency.
Akihito has had various health problems in recent years, including pneumonia and prostate cancer. He has cut back on public duties but appears relatively healthy.
According to Kyodo News agency, the emperor will get tests for his heart, which may be suffering from a deficient blood supply.
In November, Akihito was hospitalised for 19 days for mild pneumonia.
Akihito, who ascended the throne in 1989 following the death of his father Hirohito, underwent surgery for prostate cancer in 2003.
