greater pallidal volume than did patients with anxiety disorders (Radua et al., 2010). An even larger cross‐disorder meta‐analysis of brain volume across mental disorders, including 193 studies (15,892 subjects) in six diagnostic groups (schizophrenia, bipolar disorder, major depressive disorder, substance use disorder, OCD, and anxiety disorders) showed that smaller volume of the dACC and bilateral insula/operculum was not specific to OCD, but was consistently present across all these psychiatric disorders (Goodkind et al., 2015).
