Putaminal rim sign
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The putaminal rim sign, also known as the putaminal slit sign, is said to be a relatively specific sign of multiple system atrophy - parkinsonism (MSA-P), and refers to a linear region of high signal surrounding the lateral aspect of the putamen at 1.5 T MRI on T2 weighted images or ADC map.
Unfortunately, this appearance can be seen in normal individuals when imaged with 3 T MRI 1.
- 1. Lee WH, Lee CC, Shyu WC et-al. Hyperintense putaminal rim sign is not a hallmark of multiple system atrophy at 3T. AJNR Am J Neuroradiol. 2005;26 (9): 2238-42. AJNR Am J Neuroradiol (full text) - Pubmed citation
- 2. Tha KK, Terae S, Tsukahara A et-al. Hyperintense putaminal rim at 1.5 T: prevalence in normal subjects and distinguishing features from multiple system atrophy. BMC Neurol. 2012;12 (1): 39. doi:10.1186/1471-2377-12-39 - Free text at pubmed - Pubmed citation