ABSTRACT Introduction: We report a case of dementia with a speech pattern characterized by sound prolongation, describing the evolution of language symptoms. The characteristic of this case is that, although the lesion was located in the medial temporal lobe, parietal lobe, and posterior regions, their language symptoms exhibited characteristics typically associated with anterior lesions, such as disturbances in prosody. Methods: Initially diagnosed with suspected Alzheimer’s disease in year X, the patient underwent monthly cognitive and language function assessments by a speech‐language pathologist during outpatient visits from X+6 years to X+6 years and 49 months. Results: Although the patient exhibited symptoms consistent with Alzheimer’s‐type dementia, the observed speech pattern could not be entirely attributed to dementia alone. Prolongation of articulatory movements, syllable segregation, effortful articulations and unintelligible utterances were reported during resting states. The symptoms were analyzed based on the functional aspects of the speech production mechanism and compared with characteristics of apraxia of phonation, motor dysarthria, apraxia of speech, primary progressive apraxia of speech(PPAOS), aphasia, and vocal tics. Unlike previous reports linking similar symptoms to anterior brain lesions, the patient’s repetitive speech patterns resembling perseverative language did not entirely align with the identified lesion sites or clinical findings. Conclusion: The patient had severe hearing loss, which limited the assessment. Although it is difficult to determine which of these factors was the primary factor and how they interacted with each other, recording language symptoms over the course of several years elucidated valuable insights into the evolving speech characteristics in dementia.
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