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Hydrocephalus and glaucoma are theoretically forms of third spacing , but the volumes are too small to induce significant shifts in blood volumes , or overall body volumes , and thus are generally not referred to as third spacing .
 Hydrocephalus, glaucoma
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:
 Hydrocephalus, glaucoma