Minor physical anomalies in patients with schizophrenia and their parents: prevalence and pattern of craniofacial abnormalities

Abstract

The frequency of minor physical anomalies (MPAs) in patients with schizophrenia suggests an early disturbance in the development of the neuroectoderm. To improve the phenotypic delimitation of this disorder, we used a comprehensive scale of MPAs (41 items) in patients with schizophrenia and their first-degree relatives. This scale, adapted from a revised version of the Waldrop Scale (Ismail et al. Minor physical anomalies in schizophrenic patients and their siblings, American Journal of Psychiatry 155, 1998a, 1695–1702), introduced new items assessing facial and limbs asymmetry. The interrater reliability between two examiners was good: intraclass correlation coefficient: 0.68 (0.42–0.92). Patients with schizophrenia ( n=40; mean=5.8, S.D.=4) and their non-psychotic parents ( n=45; mean=4.7, S.D.=2.8) had significantly more MPAs than healthy comparison subjects ( n=42; mean=2.2, S.D.=1.2). A logistical regression model showed the ability of several items to predict group status, including facial asymmetry, cleft palate, hair whorls and abnormal palmar crease. The high prevalence of facial asymmetry in patients with schizophrenia and their first-degree relatives provides new insights into the underlying dysembryogenic processes. This revised scale thus appears to be a useful complementary tool in pathophysiological studies aiming at the identification of developmental factors in schizophrenia.