Abstract：
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.
摘要：
一名67岁的男子被转诊到我们医院进行前列腺癌的诊断和治疗。多学科的讨论导致了激素治疗之前的调强放疗。放疗前,在前列腺和直肠之间放置可生物降解的水凝胶间隔物(HS),以降低放射损伤风险.安置后三周，盆腔磁共振成像显示HS迁移到盆腔静脉.随后的全身对比增强计算机断层扫描（CECT）显示HS迁移到肺动脉中。患者没有表现出症状或临床体征。放射治疗顺利完成。在放置后5个月使用CECT图像确认迁移的HS的完全吸收。
