Well I'm no Doctor, so I don't claim to know how to read x-rays, but I do think it sure looks like a large flap of skull at the top/back of the x-ray. I also think that there were bullet fragments found in the skull and brain. (there's even x-rays of it...though I don't know that Carcano full metal jacket bullets are known for fragmentation, especially after what the magic bullet went through) I also think that I can supply you with tons of differing opinions by Doctors and experts on those x-rays and autopsy photos. Here's one such differing opinion, which I posted earlier. You may have missed it....
"...between 1992 and 1998, the Assassinations Records Review Board asked three independent forensic specialists to review the photographs and X-rays and all three were in unanimous agreement that the skull X-rays show no entry hole of any kind at any point on the back of the head. (Doug Horne, Inside the ARRB, pgs. 584-586) And, in fact, both of Hume's colleagues at the autopsy had already admitted as much.
In 1978, Dr. J. Thornton Boswell admitted to the HSCA pathology panel that what they had actually discovered after reflecting the scalp was not a through-and-through hole but a semicircular, beveled notch on the margin of the large defect, (7HSCA246, 260) a fact confirmed by Dr. Pierre Finck in his appearance before the Warren Commission when he explained that a “portion of [a] crater” had been used to identify the point of entrance. (2H379) So the conclusion that a bullet had entered the back of the head at this point was based on an inference and not on observation as Humes had claimed. And the alleged beveling of this notch was not the "foolproof" indicator he claimed it was. When a through-and-through hole is present, beveling is usually a valid indicator. But even then, as Dr. Donald Thomas writes in his brilliant book, Hear No Evil:
“There are important exceptions...even through-and-through perforations, are not infrequently beveled on the impact side...collateral information (evidence from the scalp wound, bone chips, fracture patterns, angle of trajectory, bullet fragments) must all be taken into consideration rather than reliance on external beveling alone...a common exception to the beveling rule are tangential entrance wounds, which may be beveled on either or both sides. The fact is, however, when dealing with fragments or margins of bone, and not through-and-through holes, all bets are off. [emphasis mine] This is because the laminate nature of the cranial bone lends itself to chipping that can easily be confused with beveling.” (pgs. 272-273)
One cannot help thinking that Dr. Humes was fully cognizant of the problems with relying solely on beveling which is why he lied and said that he had found a through-and-through hole. The fact is, as observers of the autopsy have confirmed, the autopsy doctors were confused by the evidence in front of them and, in reaching their conclusions, relied on reports coming in from Dallas that a lone assassin had fired on the President from above and behind."
