He couldn't explain what had happened. [He said,] 'Did something happen to [my] head? Maybe I had a brain tumor, or something in my head?" the magazine reports Williams said right before he made what critics called a half-hearted apology on air.
http://www.msn.com/en-us/tv/news/brian-williams%e2%80%99-explanation-to-nbc-news-honchos-%e2%80%98maybe-i-had-a-brain-tumor%e2%80%99/ar-AAaxEOy
http://www.msn.com/en-us/tv/news/brian-williams%e2%80%99-explanation-to-nbc-news-honchos-%e2%80%98maybe-i-had-a-brain-tumor%e2%80%99/ar-AAaxEOy