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The study population comprised 23 patients with histopathologically proven primary brain tumours ; 14 had high - grade gliomas , and nine low - grade brain neoplasms .
 primary brain tumours, high - grade gliomas, low - grade brain neoplasms
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 primary brain tumours, high - grade gliomas, low - grade brain neoplasms