Fig. 24.9 
Macroadenoma. 
Sagittal T1-weighted MR image (a) showing a large sellar/suprasellar macroadenoma. Coronal image (b) following contrast administration shows diffuse homogeneous enhancement with upward displacement of the optic chiasm more clearly identified. Coronal CT (c) of a macroadenoma in a different patient also demonstrating diffuse homogeneous enhancement.