Post-mortem tetramorphism: Four morphological changes within the same corpse.

Transformative processes generally occur singly and jointly involving the whole body. Rarely, they appear simultaneously as distinct transformative phenomena. The case study relates to a corpse found inside a storage tank in a rather unusual position, during the winter months. On external examination carried out at the crime scene, both legs and feet were out of the well bending over the storage tank and showing skeletonisation and tissue defects due to biting inflicted by the environmental macrofauna. The thighs were also skeletonised, inside the well but not immersed in the water, as was the torso which, however, was entirely corified. The colliquated shoulders, head and upper limbs were fully immersed into the water as well as the macerated hands. The corpse was exposed simultaneously to three different environmental conditions: the external setting with changes in temperature, rainfall and the action of the macro fauna, the unventilated and humid setting inside the tank, and lastly the stored water. The corpse, lying in a specific position and being exposed to different atmospheric conditions, underwent four post-mortem changes at the same time, making it challenging to estimate the time of death, based only on the available data and macroscopic findings.