May have an insult from significant illness or clinical events that could have caused this in autism
and in Chiari there can be Pukinje cell loss a Damaged Cerebellum.
The removed tissue could clearly be classified as abnormal.
PCL is found in a number of degenerative brain disorders and when brain tissue is deprived of oxygen.
Interesting.

http://www.conquerchiari.org/subs%20only/Volume%205/Issue%205(1)/Histological%20Tonsils%205(1).asp