Smith v. Leech Brain

So long as it was reasonably foreseeable that the plaintiff would suffer the type of injury she suffered, it does not matter whether the extent of injury she suffered was reasonably foreseeable.

...which is close to but not quite the same as:

The thin skull rule

Tortfeasors must take their victims as they find them.

So long as it was reasonably foreseeable that the plaintiff would suffer the type of injury she suffered, it does not matter whether the manner in which the injury occurred was reasonably foreseeable.