Medial temporal lobe atrophy score

Last revised by Assoc Prof Frank Gaillard on 11 May 2021

The medial temporal lobe atrophy (MTA) score, also known as Scheltens' scale, is useful in distinguishing patients with mild cognitive impairment and Alzheimer disease from those without impairment 2 is helpful in the assessment of patients with possible dementia (see neurodegenerative MRI brain - an approach).

Usage

Although the MTA score has been widely used, it does not capture entorhinal cortex atrophy, which has been shown to occur early in the development of Alzheimer disease. An additional scoring system entorhinal cortical atrophy (ERICA) has been developed which is reported as having better diagnostic accuracy in distinguishing healthy controls from those with Alzheimer disease 7

Classification

It is a visual score performed on MRI of the brain using coronal T1 weighted images in a plane parallel to the brainstem axis and through the hippocampus at the level of the anterior pons5. The score is also validated for assessment on CT brain6.

It is based on three features 1,3:

  1. width of the choroid fissure
  2. width of the temporal horn of the lateral ventricle
  3. height of the hippocampus

These result in a score of 0 to 4:

  • 0: no CSF is visible around the hippocampus
  • 1: choroid fissure is slightly widened
  • 2: moderate widening of the choroid fissure, mild enlargement of the temporal horn and mild loss of hippocampal height 
  • 3: marked widening of the choroid fissure, moderate enlargement of the temporal horn, and moderate loss of hippocampal height 
  • 4: marked widening of the choroid fissure, marked enlargement of the temporal horn, and the hippocampus is markedly atrophied and internal structure is lost

The score is interpreted in relation to age:

  • <75 years: ≥2 is abnormal
  • ≥75 years: ≥3 is abnormal

Atrophy has been shown to correlate with likelihood of progression from mild cognitive impairment (MCI) to dementia 4.

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Cases and figures

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