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. 2021 Mar 30;62(3):549–555. doi: 10.1093/jrr/rrab013

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© The Author(s) 2021. Published by Oxford University Press on behalf of The Japanese Radiation Research Society and Japanese Society for Radiation Oncology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 2. — Contrast-enhanced computed tomography showing the positional relationship between the tumor and the rectum. (A) Axial image before spacer placement. (B) Coronal image before spacer placement. (C) Axial image after spacer placement. (D) Coronal image after spacer placement. The yellow arrow shows the spacer. The gas is formed within the spacer due to the process of hydrolysis after placement of the spacer.