The tumor is classified into four subtypes: embryonal, botryoid, alveolar, and pleomorphic.
其
多属于胚胎或肺泡。
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Additionally, the cell wall helps maintain their shape: the round-shaped bacteria are called cocci, the rod-shaped ones are called bacilli, spiral-shaped ones are spirilla, and sometimes the same bacteria can have multiple forms in which case they're called pleomorphic.
此
，
壁有助于保持其形状：圆形的
称为球，棒状的叫做
，
旋形的是旋，有些具有不同的形态，因此它们被称为多形。
部是较大多形性腺瘤
好发部位,而较小
发生在唇、颊、龈、额、鼻唇沟部位。
