title: Gray matter volume reduction in obsessive-compulsive disorder with schizotypal personality trait.
abstract: OBJECTIVE
  Obsessive-compulsive disorder (OCD) with schizotypal personality trait (SPT) and OCD without SPT demonstrated differences in cognitive dysfunction and treatment response. This study aimed to investigate whether brain volume differs between OCD with SPT and OCD without SPT.
  
  
  METHODS
  OCD with SPT (n=20), OCD without SPT (n=47), healthy comparison subjects (n=83) and schizophrenic patients (n=59) participated in this study. We assessed brain volume such as gray matter (GM), white matter (WM) and cerebrospinal fluid (CSF) using magnetic resonance imaging. The imaging data sets were filtered using anisotropic diffusion methods to improve the signal to noise ratio. The semi-automated region-growing method was used to remove images of tissues exterior to the brain. The fuzzy C-means algorithm was used to segment the extracted brain images into gray matter, white matter and cerebrospinal fluid.
  
  
  RESULTS
  OCD with SPT (p=0.048) and Schizophrenic patients (p<0.001) demonstrated a significant GM volume reduction compared to healthy controls. OCD without SPT revealed no significant GM volume reduction compared to healthy controls (p=0.504).
  
  
  CONCLUSIONS
  This study suggests that OCD with SPT could be distinguished as a distinct subtype of OCD, based on observations of gray matter volume.
authors.affiliation: Neuroscience Institute, Seoul National University Medical Research Center, 28 Yongon-Dong, Chongno-Gu, Seoul, 110-744, Republic of Korea.
authors.forename: Kyung
authors.initials: K
authors.lastname: Jin Lee
authors.forename: Yong
authors.initials: Y
authors.lastname: Wook Shin
authors.forename: Hwee
authors.initials: H
authors.lastname: Wee
authors.forename: Young
authors.initials: Y
authors.lastname: Youn Kim
authors.forename: Jun Soo
authors.initials: JS
authors.lastname: Kwon
mesh_terms: D000328:Adult; D001921:Brain / Q000473:pathology*; D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D009771:Obsessive-Compulsive Disorder / Q000150:complications / Q000473:pathology* / Q000523:psychology; D011569:Psychiatric Status Rating Scales; D012569:Schizotypal Personality Disorder / Q000150:complications / Q000473:pathology* / Q000523:psychology