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His brain magnetic resonance image ( MRI ) showed abnormalities in the bilateral cerebellar hemispheres and brain stem , but not in the cerebral white matter , where marked reductions of the cerebral blood flow and oxygen metabolism were clearly demonstrated by positron emission tomography ( PET ) .
 Disease: abnormalities in the bilateral cerebellar hemispheres
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: abnormalities in the bilateral cerebellar hemispheres