Dam the lack of editting . I sent this before I had finished.
This is a better explanation than I can do. I have translated this for ease. From forensic examination.
With a long stay of the corpse in conditions of low temperature (below 0 ° C), tissue freezing occurs. It is superficial and complete. Freezing of brain tissues in some cases leads to an increase in brain volume with subsequent cracking of the skull bones.and seam separation. When cracking the bones of the skull, post-mortem ruptures can occur, the skin in the area of which is saturated with hemolyzed blood, which can be mistaken for intravital traumatic brain injury. Divergence of the sutures of the skull and even fractures of the bones of the cranial vault due to glaciation of the substance of the brain occur in those cases when the organs and tissues of the neck first freeze through (for example, there is a headdress on the head of the deceased, and the neck remains unprotected from the effects of cold). In other cases, the “wedging” of the freezing brain into the large occipital foramen occurs (if there is no headdress, and the neck is wrapped in a scarf), while the divergence of the seams is not observed.
A case study below.
Mr. N., aged 18, froze to death in a field during a snowstorm. His body was found 26 days later.
The posture of the corpse is typical of death from cold - the head and torso are slightly tilted forward, the arms are bent and the fists are located below the chin, the legs are slightly bent at the knee and hip joints.
There were many small brown-red abrasions and scratches on the face and back of the hands. No other damage was found on external examination.
In the soft integuments of the occipital and adjoining parts of the parietal region on the right, there are two moderate hemorrhages 3 × 4 cm. On the bones of the cranial vault, from the right parietal tubercle to a point located 2 cm above the outer end of the left superciliary arch, there is an arcuate fissure with uneven edges 17 cm long, the bulge of which was, on the left, slightly below the upper temporal line. The greatest width of the crack was 0.1 cm. The thickness of the bones along the crack was 0.3–0.4 cm. There were no additional cracks along the edge of the inner bone plate. There were no hemorrhages in the soft tissues along the crack.
According to the crack, there were ruptures of the dura mater: 0.7 cm long, 2.5 cm and ... cm long, separated by narrow bridges.
to continue
Diagnosis of the postmortem origin of cracks in the bones of the skull can be difficult, especially in the presence of significant putrefactive changes.
In this case, the following were taken into account: the localization of the crack, the remoteness and insignificance of hemorrhages in the soft tissues of the head, the absence of additional damage to the inner plate of bones along the edges, cracks and hemorrhages in the surrounding tissues in the presence of ruptures of the dura mater.
This led to the conclusion that an isolated crack in the bones of the cranial vault arose posthumously, due to the freezing of the corpse.
I would say it's similar to Rustem injuries