A man is critically injured after he was struck by a vehicle in Etobicoke.Toronto police and paramedics were called to the area of Dundas Street West and Islington Avenue just before 8 a.m. on Tuesday.Paramedics rushed the man, believed to be around 50 years old, to the hospital with life-threatening injuries.Police say the driver remained at the scene.The westbound lanes of Dundas are closed at Islington for the collision investigation.