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The etio-pathophysiology of obsessive-compulsive disorder (OCD) can be explained using a biopsychosocial model. Little is known about obsessive-compulsive symptoms (OCS) in the context of chromosomal disorders involving the X chromosome. Case studies of two patients with chromosomal disorders involving the X chromosome (Patient 1 with a variant of Turner syndrome and Patient 2 with triple X syndrome). Both patients were treated due to severe OCS. In the research MRI analysis, the most pronounced MRI change in both patients was a gray matter volume loss in the orbitofrontal cortex. Patient 1 additionally showed left mesiotemporal changes. Patient 2 presented with global gray matter volume reduction, slowing in EEG, and a reduced intelligence quotient. OCS could occur in the context of Turner syndrome or triple X syndrome. The detected MRI changes would be compatible with dysfunction of the cortico-striato-thalamo-cortical loops involved in OCD pathophysiology. Further studies with larger patient groups should investigate whether this association can be validated.

Obsessive-compulsive symptoms in two patients with chromosomal disorders involving the X chromosome