A 50-year-old Boston man remained in critical condition yesterday at Mass. General Hospital after sustaining life-threatening injuries when his motorcycle struck a car, police said. The motorcyclist was riding on Marlborough Street, near his Berkeley Street home, around 5:50 p.m. Sunday when he crashed into the rear of a Subaru, according to Boston police. The victim, who was breathing but unresponsive when emergency personnel arrived, sustained head injuries and multiple injuries to his body, police said. http://www.bostonherald.com/news/re...otorcyclist_seriously_hurt_in_back_bay_crash/