Intraoperative Photographs Showing a Step-by-Step Tentorial Resection Technique. A and B, Cutting the tentorium on the border of the transverse sinus. C, Cutting the tentorium on the border of the superior petrosal sinus. D, The trochlear nerve entering the free border of the tentorium. E and F, The tentorium is completely resected, revealing the posterior aspect of the mesial temporal lobe (Mes. Temp. Lobe). (Images courtesy of E de Oliveira)