Relevance of non-specific MRI features in multiple system atrophy

Area of Science:

• Neurology
• Radiology
• Neuroimaging

Background:

• Diagnostic utility of specific MRI features like the 'hot-cross bun' sign and 'hyperintense putamen rim' in Multiple System Atrophy (MSA) is limited due to their rarity.
• Investigating non-specific MRI findings alongside specific signs can improve diagnostic accuracy for MSA.

Purpose of the Study:

• To evaluate the diagnostic utility of both specific and non-specific MRI features in patients with Multiple System Atrophy (MSA).
• To identify common MRI patterns associated with the Parkinsonian (MSA-P) and cerebellar (MSA-C) variants of MSA.

Main Methods:

• Analysis of clinical and MRI features in 53 indoor and outdoor patients diagnosed with MSA.
• Categorization of patients into MSA-P and MSA-C variants for comparative analysis of MRI findings.

Main Results:

• Midbrain atrophy (69.8%), cerebellar atrophy (84.9%), and corpus callosal atrophy (73.6%) were frequently observed in MSA patients.
• The 'hot-cross bun' sign (24.5%) and 'hyperintense putamen rim' (35.8%) were less common.
• Midbrain atrophy was noted in 70.3% of MSA-P and 68.8% of MSA-C; cerebellar atrophy in 81.1% of MSA-P and 93.8% of MSA-C; corpus callosal atrophy in 75.7% of MSA-P and 68.8% of MSA-C.

Conclusions:

• The 'hot cross bun' sign and 'hyperintense putamen rim' are infrequently observed in MSA, limiting their standalone diagnostic value.
• A combination of midbrain atrophy, corpus callosum atrophy, and cerebellar atrophy is a more common finding and holds significant diagnostic value for both MSA-C and MSA-P.