Cranial deformation has been widely practiced throughout history, as Watchman states, even in 17thC mid France apparently. The Flathead Native American tribe used to bind wood to the heads of infants in order to achieve flattening of the skull. The skull in the picture belongs to a Hun woman and it is one of many similarly deformed skulls that have been discovered. The elongation is achieved by head binding.
Here is the dilema; not all Hun finds contain evidence of this practice so it is hard to understand the reasons. The Sarmatians have been linked to the same practice so there are many theories. Perhaps the Huns adopted some Sarmatian culture from the tribes they conquered? Perhaps it was only Sarmatian descendants who carried on the head binding? Maybe the Sarmatians adopted Hun practices? Could these be the skulls of an Elite class? There have also been Gothic remains displaying evidence of cranial deformation so the best we can do is guess

......Orda