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It occludes about half the lumen , and consequently takes an approximately semi - circular shape when viewed from the saccular side ( Frishkopf and Flock 1974 ; Wever 1985 ) .
 Anatomy: lumen; Anatomy: saccular
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: lumen; Anatomy: saccular