Left Paramedian Supracerebellar Approach. A and B, The retraction for the paramedian approach has been shifted to the left of the vermis. C, The venous complex above the pineal body can be observed in the upper part of the view. The upper margin of the operative field is the tentorial apex. D, The basal vein, the P3 segment, and the medial posterior choroidal artery have been retracted to expose the posterior part of the third ventricle. E and F, The paramedian approach provides easy access to the pineal body, the ipsilateral quadrigeminal plate, the trochlear nerve, the superior and middle cerebellar peduncles, and the P3 segment. (Images courtesy of AL Rhoton, Jr.)