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A " syrinx " is a rare , fluid-filled neuroglial cavity within the spinal cord ( syringomyelia ) , in the brain stem ( syringobulbia ) , or in the nerves of the elbow , usually in a young age .
 syringobulbia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 syringobulbia