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. 2022 Nov 1;13(1):441–448. doi: 10.21037/qims-22-471

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2023 Quantitative Imaging in Medicine and Surgery. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Video 1 — Confirmation of the “lumen” of the lower rectum using a clear plastic tube proctoscope. After being deeply inserted into the rectum, the proctoscope is pulled back to the dentate line to identify the Herrmann line. Then, the hemorrhoid region is pushed a few millimeters into the rectum to determine whether a space is present and that the mucosal surfaces do not touch each other. This video shows the “lumen negative” state before ALTA sclerotherapy, in which the lumen does not exist due to the hemorrhoid, and the “lumen positive” state after treatment. ALTA, aluminum potassium sulfate and tannic acid.