We report here a patient in whom the effects of a cerebellum mass may have led to development of obsessive-compulsive disorder\n(OCD). A 33-year-old woman showed symptoms of OCD, including obsessive worry about infection from tainted blood and\nrepetitive confirmation, which worsened during pregnancy. She had comprehension in regard to her illness and no evidence of\ncognitive dysfunction and did notmeet other DSM-5 criteria such as depression. One month after giving childbirth, the symptoms\nworsened, while headache and dizziness also developed. The Yale-Brown Obsessive-Compulsive Scale (Y-BOCS) score was 34.The\npatient was examined for a headache and a posterior cranial fossameningioma was found. Following resection of the meningioma,\nthe OCD symptoms were remarkably reduced (Y-BOCS score 10).There is only one previous report of pure OCD associated with\na cerebellar mass and the present findings should help to elucidate the mechanism.
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