FIG 3. Images obtained in a 54-year-old-man with small-cell lung cancer. In this patient, FLAIR imaging was the second postcontrast sequence.

A and B, Nonenhanced (A) and contrast-enhanced (B) FLAIR images show involvement of the prechiasmal portion of the right optic nerve (white arrow) and extension to the optic chiasm (black arrow) and right optic tract (arrowhead). These findings appear as abnormal hyperintensity in A and as abnormal contrast enhancement in B.

C, Contrast-enhanced T1W image. Although involvement of optic chiasm is shown as abnormal contrast enhancement (arrow), involvement of the right optic nerve and right optic tract could not be detected.