Fig. 1

The intraoperative view, a 0° angled scope. a Elevation of the In Situ Bone Flap from the dura below it using a Cottle dissector; B: Endoscopic view showing the tumor after pituitary transposition; PS pituitary stalk, PG pituitary gland, OC optic chiasm, TM tumor. c Endoscopic view showing the tumor; III oculomotor nerve; BA basilar artery, PCA posterior cerebral artery, SCA superior cerebellum artery, TM tumor. d After the tumor removal, the endoscopic view shows the exposure of the third ventricle (TV) with the resulting high-flow CSF leakage, and the pituitary stalk (PS), optic chiasm (OC) and transposed pituitary gland (TPG)