Rinsho Shinkeigaku (Clinical Neurology)

Review

Non-aphasic misnaming: a case report and literature review

Yuichiro Inatomi, M.D.1), Minoru Matsuda, M.D.2) and Hideko Mizuta, RST, Ph.D.3)

1) Department of Neurology, Saiseikai Kumamoto Hospital
2) Izumi-no-mori Clinic
3) Department of Rehabilitation, Fujii-kai Rehabilitation Hospital

A 71-year-old, right-handed woman was admitted to our hospital due to a sudden difficulty with conversation. On admission, she was alert, but had a euphoric mood, disorientation, and a disturbance of recent memory. Her speech was fluent. Her repetition and auditory word cognition were excellent, but she had a slight difficulty with naming visual objects. She frequently showed word-finding difficulty and irrelevant paraphasia during free conversation and a word fluency task. Her irrelevant paraphasia was observed more frequently when she was asked to explain her outbreak of anger at the hospital, i.e., it was situation-dependent. She also had anosognosia. MRI showed an infarct in the territory of the left tuberothalamic artery. Single-photon emission computed tomography revealed low-uptake lesions in the left thalamus and orbital frontal, medial frontal, and medial temporal lobes. The patient was diagnosed with non-aphasic misnaming. The clinical characteristics of patients with non-aphasic misnaming in the literature were reviewed. All of the patients with non-aphasic misnaming had word-finding difficulty and irrelevant paraphasia. Additionally, they had either emotional disturbance or anosognosia.
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(CLINICA NEUROL, 61: 288−296, 2021)
key words: non-aphasic misnaming, irrelevant paraphasia, thalamus, anosognosia, situation-dependent

(Received: 14-Sep-20)