Acta Medica Okayama 77巻 6号
2023-12 発行
Kojima, Katsuhide
Department of Radiology, Okayama University Hospital
Takahashi, Yuka
Department of Radiology, Okayama University Hospital
Sugiyama, Soichi
Department of Proton Beam Therapy, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
Asano, Yudai
Department of Radiology, Okayama University Hospital
Okawa, Nanako
Department of Radiology, Okayama University Hospital
Makimoto, Satoko
Department of Radiology, Okayama University Hospital
Higaki, Fumiyo
Department of Radiology, Okayama University Hospital
Iguchi, Toshihiro
Department of Radiological Technology, Faculty of Health Sciences, Okayama University
Kaken ID
Hiraki, Takao
Department of Radiology, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
Kaken ID
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A 67-year-old man was referred to our hospital for the diagnosis and treatment of prostate cancer. Multidisciplinary discussion led to intensity-modulated radiotherapy preceded by hormone therapy. Before radiotherapy, a biodegradable hydrogel spacer (HS) was placed between the prostate and rectum to reduce radiation injury risk. Three weeks postplacement, pelvic magnetic resonance imaging revealed HS migration into the pelvic vein. Subsequent whole-body contrast-enhanced computed tomography (CECT) revealed HS migration into the pulmonary artery. The patient showed no symptoms or clinical signs. Radiotherapy was completed uneventfully. Complete absorption of the migrated HS was confirmed using CECT images 5 months postplacement.
