My rear tire is bent inward looks like the front tire when turned to the right.?

[PssdoffChik]

I got hit in the back passenger tire and the tire is twisted inward. It still rolls and the alloy rim isnt dinted or anything the tire is just not straight and the car is not drivable. What could be the damage? Could it be major. It seems like im riding on a flat tire. Its a Nissan Altima 2002.