1、The most common type of pituitary adenoma is a prolactinoma, which produces too much prolactin hormone.
（腺垂体腺瘤中最常见的类型是导致催乳素过多的泌乳腺瘤。）

2、Adenomas are usually benign tumors that grow slowly and may cause few or no symptoms.
（腺瘤通常是生长缓慢并且可能没有或只有少量症状的良性肿瘤。）