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Imaging in primary progressive aphasia

K Abe1, H Ukita, T Yanagihara

  • 1Department of Neurology, Osaka University Medical School, Japan.

Neuroradiology
|August 1, 1997
PubMed
Summary
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Primary progressive aphasia (PPA) involves speech and cognitive decline. This study correlates PPA patient symptoms with MRI and SPECT imaging, revealing distinct patterns for nonfluent and fluent aphasia types.

Area of Science:

  • Neurology
  • Neuroimaging
  • Speech Pathology

Background:

  • Primary progressive aphasia (PPA) is a neurodegenerative disorder characterized by progressive language impairment.
  • Understanding the relationship between clinical presentation and underlying brain pathology is crucial for diagnosis and management.
  • Previous studies have highlighted the heterogeneity of PPA, necessitating further investigation into specific subtypes.

Purpose of the Study:

  • To investigate the correlation between clinical signs and neuroimaging findings in patients with primary progressive aphasia (PPA).
  • To differentiate between nonfluent and fluent subtypes of PPA based on their characteristic speech impairments and associated brain atrophy patterns.
  • To elucidate the functional anatomy underlying speech deficits in PPA through integrated clinical and imaging data.

Related Experiment Videos

Main Methods:

  • Case study approach involving five patients diagnosed with PPA.
  • Clinical assessment focusing on speech characteristics, including bradylalia and word amnesia.
  • Neuroimaging techniques including Magnetic Resonance Imaging (MRI) for structural atrophy assessment and Single Photon Emission Computed Tomography (SPECT) with 99mTc HMPAO for regional cerebral blood flow evaluation.

Main Results:

  • Patients were categorized into nonfluent (Group 1) and fluent (Group 2) aphasia groups.
  • Group 1 exhibited bradylalia, with MRI showing left frontal and perisylvian atrophy and reduced SPECT uptake in these areas.
  • Group 2 presented with word amnesia, demonstrating left temporal atrophy (superior, middle, inferior gyri, hippocampus, parahippocampal gyrus) on MRI and corresponding SPECT reductions.

Conclusions:

  • Distinct patterns of brain atrophy and hypoperfusion correlate with specific clinical subtypes of PPA.
  • Left frontal/perisylvian changes are associated with nonfluent PPA and bradylalia.
  • Left temporal lobe involvement, including medial structures, characterizes fluent PPA with word amnesia.