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Pineal region tumors represent a formidable challenge to the neurosurgeon. Choosing the right approach is key to optimizing the extent of resection and minimizing surgical morbidity. In this video, the authors show an interhemispheric transcallosal approach to a pineal region tumor in a 15-year-old boy. The advantage of this corridor over posterior approaches is that it provides a nice view of the tumor plane with the venous complex, especially while dissecting tumor from the anterior aspect of the internal cerebral veins on their vertical path. Thus, this approach represents a safe and effective alternative for selected pineal tumors. The video can be found here: https://stream.cadmore.media/r10.3171/2021.4.FOCVID2120., Competing Interests: Disclosures The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this publication., (© 2021, The Authors.)

The safe entry zones into the brainstem provide access to challenging lesions in this region that do not reach the surface. However, in large brainstem tumors there are two issues to bear in mind before deciding the approach. First, the anatomy can be distorted, and it can be difficult to recognize the entry zone. Second, for large brainstem lesions it may be challenging to address the whole tumor from only one zone and combined approaches may be required. Thus, we show a combined approach, infratentorial supracerebellar and telovelar transventricular, to remove a large brainstem tumor. Appropriate consent was obtained. The video can be found here: https://youtu.be/nCcG9zPq7ug., Competing Interests: Disclosures The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this publication., (© 2019, Guillermo Aldave.)