Hemispheric asymmetries, fourth ventricular size, and cerebellar morphology in autism.

Doctors took CT brain scans of adults with autism and adults without it.

They measured the size of the fourth ventricle and looked at the cerebellum.

They also checked if the left and right sides of the brain were different sizes.

The scans looked the same in both groups.

No extra large ventricles. No shrunken cerebellum. No lopsided hemispheres.

In short, the brains showed no outer signs of autism.

Bromley et al. (1998) later used better MRI machines and still found no size gap in the hippocampus.

Pilgrim et al. (2000) ran a simple eye-movement test and saw normal cerebellar reflexes in autistic kids.

Laidi et al. (2019) seems to clash: they found thinner cortex in one spot. The gap likely comes from newer MRI that can measure paper-thin layers, while 1988 CT only saw big shapes.

Worsham et al. (2015) went deeper, showing weaker talk between hemispheres with EEG. No shape problem, but a wiring problem.

This paper tells you not to expect clear brain shape clues on a basic scan. When families ask, "Will an MRI show autism?" you can say outer shape usually looks typical. Focus your energy on behavior and learning history, not hunting for a cerebellar smoking gun.