MRI shows a well defined soft tissue mass lesion in the sellar region which enlarges the sella and extends to the suprasellar cistern, and right ethmoid and sphenoid sinuses. There is also a bilateral encasement of the carotid arteries especially at the left side (best shown on CT images). It is mainly homogenously hypo signal on both T1 and long TR images. After the administration of intravenous gadolinium the mass shows marked enhancement.