英语语法分析

Primary adrenal insufficiency is most frequently caused by autoimmune adrenalitis, and hypothalamic-pituitary tumors represent the most frequent cause of secondary adrenal insufficiency.

原发性肾上腺功能不全绝大多数是由自身免疫性肾上腺炎引起，而对于下丘脑-垂体瘤则是继发性肾上腺功能不全的主要原因。