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Evidence of previous right frontal craniotomy. There is a partial fat density, partial soft tissue density (fat-soft tissue level) ovoid, lobulated mass centered within the suprasellar cistern, the fatty component measuring 2.5cm (trans) x 3cm (ap) x 2.2cm (cc). The mass, predominantly its fatty component, extends through a defect in the anteroinferior sella turcica/jugum into and largely filling the left sphenoid sinus and left posterior ethmoidal air cells (a probable solid component in the left lateral wall of the sphenoid sinus) into left superior ethmoidal recess, thence along the posterosuperior nasal septum, which appears slightly fragmented. A fistulous tract to skin is not seen. No orbital extension seen.
A contiguous soft tissue density posterior component to the mass also resides within the suprasellar cistern, centered slightly to the right of the midline, effacing the floor of the third ventricle and with likely optic chiasm mass effect, poorly seen on these images.
Multiple locules of fat attenuation are seen within the subarachnoid space, within the Sylvian fissures and interhemispheric fissure. There is some subtle fat attenuation within the region of the left choroid plexus and another speck along the septum pellucidum anterosuperiorly related to the calcified pineal gland. No other hypoattenuation is seen within the ventricles.