teratoma      
noun [ C ]  medical specialized uk/ˌter.əˈtəʊ.mə/ us/ˌter.əˈtoʊ.mə/  teratomas or teratomata
 畸胎瘤
a tumour (= a mass of diseased cells) that is formed of tissues that are not normally present where the tumour is found
 
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