BBC NEWS | Health | Brain scans ‘may detect OCD risk’:
Individuals with OCD and their close relatives have distinctive patterns in their brain structure, a team at Cambridge University found. The genes responsible remain unknown, but it appears they change the brain’s anatomy, which may aid diagnosis.
Alas, the very fact that close relatives who don’t have OCD have similar patterns of brain microanatomy suggests that this is not entirely a useful way to go. A little like finding out that being short is a risk factor for falling off chairs while changing light bulbs.