Berkshire Hathaway (NYSE:BRK.A, BRK.B) CEO and Chairman Warren Buffet revealed this afternoon that he has recently been diagnosed with early-stage prostate cancer. The 81-year-old legendary manager and investor says other than getting prescribed treatments, the disease will not “otherwise change my daily routine.”

Prostate cancer, especially when it strikes older men, can often be managed without radical treatments. Apparently in the spirit of swift and full disclosure, the following letter was posted on Berkshire’s site:

To the Shareholders of Berkshire Hathaway:

This is to let you know that I have been diagnosed with stage I prostate cancer. The good news is that I’ve been told by my doctors that my condition is not remotely life-threatening or even debilitating in any meaningful way. I received my diagnosis last Wednesday. I then had a CAT scan and a bone scan on Thursday, followed by an MRI today. These tests showed no incidence of cancer elsewhere in my body.

My doctors and I have decided on a two-month treatment of daily radiation to begin in mid-July. This regimen will restrict my travel during that period, but will not otherwise change my daily routine.

I feel great — as if I were in my normal excellent health — and my energy level is 100 percent. I discovered the cancer because my PSA level (an indicator my doctors had regularly checked for many years) recently jumped beyond its normal elevation and a biopsy seemed warranted.

I will let shareholders know immediately should my health situation change. Eventually, of course, it will; but I believe that day is a long way off.

Warren E. Buffett