Adult-onset Huntington's disease that presented without chorea

We herein report a case of late-onset Huntington's disease (HD) that presented without any involuntary movement. The patient was in her forties at onset, and she lacked any rigidity; thus, the HD in this case was completely different than the Westphal variant. The diagnosis was made by confirming the expansion of CAG repeats in the HD gene after obtaining information about her sister's clinical features, since her sister presented with typical HD. In late onset HD, involuntary movement is thought to be the core feature; therefore, the clinical features of this case are considered to be unique and noteworthy.