Emperor Akihito has marked two years since his coronary-artery bypass surgery, with doctors describing him as "generally healthy," the Imperial Household Agency said.

The Emperor, who turned 80 in December, also has osteoporosis, but its progression has stopped, according to the doctors serving the Imperial household. With anxiety over his heart conditions lessened, he can now exercise, which has a positive effect on his osteoporosis, they said.

The Emperor developed osteoporosis due to the effects of hormone therapy that followed his 2003 surgery to treat prostate cancer. The latest examination showed that the condition, which causes brittle bones, has not progressed.