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Medial temporal lobe atrophy in memory disorders

F Pasquier¹, M Hamon, F Lebert

¹Department of Neurology, University Hospital, Lille, France.

Journal of Neurology

|March 1, 1997

Summary

Medial temporal lobe atrophy on CT scans can help diagnose Alzheimer's disease (AD). Measuring the medial temporal lobe width accurately identifies AD patients, aiding early diagnosis in memory clinics.

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Area of Science:

Neurology
Radiology
Geriatrics

Background:

Medial temporal lobe atrophy is a known indicator of Alzheimer's disease (AD).
Early and accurate diagnosis of AD is crucial for effective patient management.
Temporal lobe oriented computed tomography (CT) offers a potential method for assessing this atrophy.

Purpose of the Study:

To evaluate the diagnostic accuracy of medial temporal lobe measurements using CT.
To assess the utility of this method for diagnosing AD, particularly in early stages.
To determine the optimal cut-off for medial temporal lobe width in AD diagnosis.

Main Methods:

A total of 333 patients from a Memory Disorders Clinic were included.
Patients were categorized into probable AD, possible AD, miscellaneous memory disorders, anxious/depressed, and controls.

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Minimum medial temporal lobe width was measured using temporal lobe oriented CT scans.

Main Results:

A cut-off of 11.5 mm best distinguished AD patients from non-AD patients.
The measurement showed a sensitivity of 0.81 and specificity of 0.95 for probable AD.
Diagnostic accuracy for probable AD was 0.83, with a high positive predictive value (0.99).

Conclusions:

Temporal lobe oriented CT measurement of medial temporal lobe atrophy is a valuable tool for AD diagnosis.
This method demonstrates high accuracy and specificity, supporting its use in routine clinical practice.
The findings suggest its utility for assessing AD, especially in early disease stages.