From the case:
Red rumped swallow (diagram)
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The tail of the swallow resembles the appearance of the healthy nigrosome-1 on HR-SWI MRI. Picture modified from Wikipedia: http://en.wikipedia.org/wiki/Swallow by Schwartz et al.
Image used under Creative Commons licence. Original source: Schwarz ST, Afzal M, Morgan PS et al. The 'swallow tail' appearance of the healthy nigrosome - a new accurate test of Parkinson's disease: a case-control and retrospective cross-sectional MRI study at 3T. PLoS ONE. 2014;9 (4): e93814. doi:10.1371/journal.pone.0093814
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