MRI may show atrophy in the midbrain with preservation of the pons giving a "hummingbird" sign appearance and Mickey Mouse sign. Types
Based on the pathological findings in confirmed cases of PSP, it is divided into the following categories:

classical Richardson syndrome (PSP-RS)
PSP-parkinsonism (PSP-P) and PSP-pure akinesia with gait freezing (PSP-PAGF)
frontal PSP, PSP-corticobasal syndrome (PSP-CBS), PSP-behavioural variant of frontotemporal dementia (PSP-bvFTD) and PSP-progressive non-fluent aphasia (PSP-PNFA)
PSP-C
PSP induced by AnnonaceaeRichardson syndrome is characterized by the typical features of PSP. In PSP-P features of Parkinson’s Disease overlap with the clinical presentation of PSP and follows a more benign course. In both PSP-P and PSP- PAGF distribution of abnormal tau is relatively restricted to the brain stem. Frontal PSP initially presents with behavioral and cognitive symptoms, with or without ophthalmoparesis and then evolve into typical PSP. The phenotypes of PSP-P and PSP-PAGF are sometimes referred as the ‘brain stem’ variants of PSP, as opposed to the ‘cortical’ variants which present with predominant cortical features including PSP-CBS, PSP-bvFTD, and PSP-PNFA. Cerebellar ataxia as the predominant early presenting feature is increasingly recognized as a very rare subtype of PSP (PSP-C) which is associated with severe neuronal loss with gliosis and higher densities of coiled bodies in the cerebellar dentate nucleus. Differential diagnosis
PSP is frequently misdiagnosed as Parkinsons disease because they both involve slowed movements and gait difficulty, with PSP being one of a collection of diseases referred to as Parkinson plus syndromes. Both Parkinsons and PSP have an onset in late middle age and involve slowing and rigidity of movement.
As well as affecting hungry people in the US, this caused prices to rise on the global markets; the US is the worlds biggest exporter of food. This led to much talk of a possible third 21st century global food crisis. The Financial Times reported that the BRICS may not be as badly affected as they were in the earlier crises of 2008 and 2011. However, smaller developing countries that must import a substantial portion of their food could be hard hit. The UN and G20 has begun contingency planning so as to be ready to intervene if a third global crisis breaks out. By August 2013 however, concerns had been allayed, with above average grain harvests expected from major exporters, including Brazil, Ukraine and the U.S. 2014 also saw a good worldwide harvest, leading to speculation that grain prices could soon begin to fall.In an April 2013 summit held in Dublin concerning Hunger, Nutrition, Climate Justice, and the post 2015 MDG framework for global justice, Irelands President Higgins said that only 10% of deaths from hunger are due to armed conflict and natural disasters, with ongoing hunger being both the "greatest ethical failure of the current global system" and the "greatest ethical challenge facing the global community."