2393
Findings of initial and follow - up MRIs were retrospectively evaluated by 2 neuroradiologists by consensus , to analyze the presence of abnormal signal intensities , their locations , and signal changes on follow - up images .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities:  
Answer:
 None