Fig. 9.

Metastasis from lung cancer in a 41-year-old man.

A. Contrast-enhanced sagittal T1-weighted MR image (600/16) depicts the markedly enhancing thickened median eminence and pituitary stalk, and less enhancing posterior lobe (arrows). The posterior lobe no longer shows high signal intensity, and the normally enhanced anterior lobe (arrowhead) is compressed and displaced anteriorly by the enlarged posterior lobe.

B. Contrast-enhanced sagittal T1-weighted MR image (600/23) obtained two months after radiotherapy shows near disappearance of the lesion. The clinical symptoms of DI were also much improved.