Language：English  

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.

DOI： 10.18926/AMO/66157

PubMed

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Language：Japanese   Publisher：金原出版(株)  

症例は60歳代女性で、胸やけを主訴とした。巨大食道憩室の経過観察中に、食道胃接合部に粘膜下腫瘍が疑われ、単純CT検査では食道胃接合部周囲に著明な石灰化を伴う全周性の腫瘤(5.5cm大)を認めた。造影CTでは食道胃接合部付近にリング状の石灰化を伴う軟部腫瘤を認め、骨条件では卵殻状の石灰化が多発しており、超音波内視鏡では第4層を主座として後方に音響陰影を伴う境界明瞭な高エコー域を認めた。生検の病理所見では異型のない重層扁平上皮を持つ食道粘膜と細胞密度の低い紡錘形細胞集塊を認め、免疫染色所見より平滑筋腫と診断した。本症例の憩室は壁外性発育した腫瘍の直上に存在する牽引性憩室で、腫瘍による牽引に伴って下部食道平滑筋などの胃酸逆流防止機能が低下し、逆流性食道炎を併発したと考えられた。画像上、石灰化の性状を確認することも画像診断において食道平滑筋腫の診断の一助になると考えられた。

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Language：Japanese   Publisher：金原出版(株)  

10歳代前半女児、腹痛、嘔吐を主訴とした。血液検査に特記すべき異常はなく、初診時の単純CTでは少量の腹水と子宮左側の低吸収域を認めた。翌日の造影CTでは血性腹水を疑う腹水の増加と拡張した左卵管と考えられる低吸収域の増大を認め、卵管壁の造影効果はみられなかった。単純MRIでは拡張した左卵管内部にT2強調像、T2*強調像で低信号を呈する液面形成像と粘膜皺、左卵管のbeak signを認めたが、左卵巣は右卵巣と同程度で異常所見はみられず、左孤立性卵管捻転を疑い腹腔鏡下左卵管切除術を行った。術中、左卵管はうっ血を伴って腫大し、反時計回りに180°捻転しており、血性腹水が貯留していたが、両側卵巣と右卵管の異常や癒着、卵管上皮の腫瘍性病変は認めなかった。今回経験した孤立性卵管捻転は小児例である点、術前診断が可能であった点が既報と異なっていた。

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Language：English   Publishing type：Research paper (scientific journal)  

PURPOSE: This study aimed to investigate the characteristics of magnetic resonance imaging (MRI) findings in pure prostatic ductal adenocarcinoma. METHODS: From January 2009 to February 2020, seven patients who were diagnosed with pure prostatic ductal adenocarcinoma and had a referable preoperative MRI scan were included in the study. We evaluated the following MRI findings for each tumor: size, location, presence of multi-cystic component, and apparent diffusion coefficient (ADC) value. RESULTS: The median maximum diameter of the tumors was 22 mm (range 19-70 mm). Regarding transverse distribution, five tumors were located in the periurethral area and two were located peripherally apart from the urethra. Two of the seven tumors had cystic components. The median ADC value of the tumors was 0.754 × 10-3 mm2/s (range 0.570-0.963 × 10-3 mm2/s). Based on the transverse distribution and components of the tumors on MRI, ductal adenocarcinomas were classified into three types: type I as a non-cystic tumor located peripherally apart from the urethra (29%, two cases); type II as a non-cystic tumor located in the periurethral area (43%, three cases); and type III as a tumor with a multi-cystic component (29%, two cases). CONCLUSION: The non-cystic mass with periurethral distribution (type II) and multi-cystic mass (type III) may be characteristic features that differentiate pure ductal adenocarcinoma from ordinary acinar adenocarcinoma on MRI.

DOI： 10.1007/s00261-022-03454-z

PubMed

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Language：Japanese   Publisher：金原出版(株)  

新規に診断された無治療の悪性リンパ腫患者28例(男性19例、女性9例、平均70.8±10.8歳)を対象としてFDG-PET/CT(PET/CT)検査400日後の短期予後と生物学的、臨床パラメータおよびSUVmaxとの関連性について後方視的に検討した。PET/CT検査400日後の生存群は19例、死亡群は9例であり、死亡群では生存群と比較して血清lactate dehydrogenase値、soluble interleukin-2 receptorが高値で、FDG集積陽性の節外病変数、臨床病期III、IV期が多く、SUVmaxはより高値であった。また、多変量解析ではPET/CTを用いて評価された節外病変数と臨床病期がPET/CT検査400日後の短期予後との間に関連性を認め、治療前のFDG-PET/CTの有用性が示唆された。

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Other Link： https://search-tp.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2018&ichushi_jid=J01565&link_issn=&doc_id=20180904090008&doc_link_id=10.18888%2Frp.0000000518&url=https%3A%2F%2Fdoi.org%2F10.18888%2Frp.0000000518&type=%88%E3%8F%91.jp_%83I%81%5B%83%8B%83A%83N%83Z%83X&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00024_2.gif

Language：English   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Recently, computed tomography with photon-counting detector (PCD-CT) has been developed to enable high-resolution imaging at a lower radiation dose. PCD-CT employs a photon-counting detector that can measure the number of incident X-ray photons and their energy. The newly released PCD-CT (NAEOTOM Alpha, Siemens Healthineers, Forchheim, Germany) has been in clinical use at our institution since December 2022. The PCD-CT offers several advantages over current state-of-the-art energy-integrating detector CT (EID-CT). The PCD-CT does not require septa to create a detector channel, while EID-CT does. Therefore, downsizing the anode to achieve higher resolution does not affect the dose efficiency of the PCD-CT. CT is an indispensable modality for evaluating ear ossicles. The ear ossicles and joints are clearly depicted by PCD-CT. In particular, the anterior and posterior legs of the stapes, which are sometimes unclear on conventional CT scans, can be clearly visualized. We present cases of congenital anomalies of the ossicular chain, ossicular chain dislocation, tympanosclerosis, and cholesteatoma in which PCD-CT was useful. This short article reports the usefulness of PCD-CT in the 3D visualization of the ear ossicles.

DOI： 10.1007/s11604-023-01485-0

PubMed

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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Event date： 2023.9.15 - 2023.9.17

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Event date： 2023.4.13 - 2023.4.16

Language：English   Presentation type：Poster presentation  

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Event date： 2022.6.17 - 2022.6.18

Language：Japanese   Presentation type：Oral presentation (invited, special)  

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Event date： 2021.6.19 - 2021.6.20

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.2

Language：Japanese  

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