This case is of a middle-aged man with moderate intellectual challenges who drowned while swimming in a lake. Here’s a picture of the brain after fixation:
I originally posted a second case in a newborn, but on review some peers believed that it was a postmortem artifact. I don’t think so, but I have deleted it. People with this abnormality are at a higher rate of seizures, which is of importance both to sudden infant death and drowning.