Ozeki Tochiazuma indicated Sunday he may retire after medical tests revealed he had suffered a brain infarction in the past.

"It's scary. It's 50-50 as to whether I'll continue my sumo career," Tochiazuma said at a press conference after four days in hospital. "I want to fight again in front of sumo fans but I would have a longer life if I quit.

Whatever I decide to do I need to have a long rest and think it over." The injury prone 30-year-old withdrew from the just-concluded Spring Grand Sumo Tournament on Thursday, complaining of headaches and dizziness.