If you're interested in reading the studies, I have the links below:
Link to the first case study (chainsaw cut across abdomen): https://pmc.ncbi.nlm.nih.gov/articles/PMC11309188/
Link to second case study (failed autodecapitation using chainsaw): https://www.researchgate.net/figure/Top-cervical-trauma-at-admission-bottom-scaring-3-weeks-after-surgery_fig2_341765628