Mark Furhman mentioned that oxygen can be cut off without leaving a trace of strangulation in a number of ways.
Actually, the autopsy raises more questions than it answers. It is skeptical that Terri suffered trauma (bone scan) and all but completely dismissive of the theory that she was bulimic. (There goes Michael's best alibi AND his malpractice suit!) This brings the focus back to what has always been the critical question:
What caused the anoxia?
Something cut off Terri's oxygen until she suffered cardiac arrest, followed quickly (one presumes) by the brain damage.
A month ago or so, I posted a link to a fascinating study by a prosecutor's office about strangulation as a form of domestic violence. It found that strangulation was far more prevalent in DV than had been realized. It also found that strangulation often leaves no marks or only minor marks, and it is regularly missed in emergency rooms.
Another study that I referred to on a different occasion found that detection of DV by emergency rooms was shockingly low -- only one case in 30, or something on that order.
In Terri's case, the resuscitation efforts were so violent that strangulation marks of any sort could easily have been missed. She was defibbed several times, trach'ed and vented. Who would think anything of marks on her throat?