PMC10351956_01
Preoperative T1-weighted gadolinium-enhanced image of the mass lesion surrounded by a cyst. The draining vessel is present at the tentorial surface of the cerebellum (arrowhead).
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Further examination revealed a strong enhancement in the tumor mass with the tumor drainer attached to its tentorial side (Fig. 1).
Endoscopic image during the surgical procedure (diameter 4 mm, 0 degrees). The paramedian tentorium was dissected (A), and the tumor and draining vein were exposed (B).
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The tumor drainer was also exposed in front of the tumor (Fig. 2).
Simultaneous operative view of the microscope (left) and endoscope (right) showing superior visualization of the subtentorial space by the endoscope.
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The tumor, drainer, and surrounding structures were well visualized by the endoscope, and only the tumor was visualized by the microscope because of the tentorium in front of the other structures (Fig. 3).