英语语法分析

The next most common location of involvement was the pontobulbar region, seen in 40% of the cases.

次常见的病灶部位分布于脑桥延髓区，约40%的患者可见此改变。

Of the 30 MDJ lesions, 11 showed a marked upward extension involving the diencephalic structures and 18 had a prominent downward extension involving the pontobulbar region.

在30处中脑-间脑接合处病灶中，11处病灶显著向上延伸累及间脑结构，18处病灶显著向下延伸累及脑桥延髓区域。