Publications by authors named "Kei Yamada"

To evaluate the efficacy and safety of unique magnetic resonance imaging (MRI)-guided interstitial brachytherapy (ISBT) for locally advanced cervical cancer that is unsuitable for intracavitary brachytherapy (ICBT) or intracavitary/interstitial brachytherapy (ICISBT). : We analyzed the clinical outcomes, including toxicity, of 68 previously untreated patients with cervical cancer treated between 2014 and 2024. : The median high-risk clinical target volume (HR-CTV) was 53.

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Purpose: To investigate temporal changes in multiparametric MRI (mpMRI) findings following lesion-targeted focal therapy with microwave tissue coagulation (MTC) for localized prostate cancer (PCa).

Methods: This retrospective study included 33 patients (34 procedures) with localized PCa who underwent lesion-targeted focal therapy with MTC between June 2019 and March 2024. Post-treatment mpMRI, including T2-weighted imaging (T2WI), T1-weighted imaging (T1WI), diffusion-weighted imaging (DWI), and dynamic contrast-enhanced MRI (DCE-MRI), was evaluated by three radiologists to analyze signal changes and enhancement patterns in the treated area.

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Background: All Hitachi proton pencil beam scanning facilities currently use discrete spot scanning (DSS). Mayo Clinic Florida (MCF) is installing a Hitachi particle therapy system with advanced technologies, including fast scan speeds, high beam intensity, rapid beam off control (RBOC), a skip spot function, and proton pencil beam scanning using dose driven continuous scanning (DDCS). A potential concern of RBOC is the generation of a shoulder at the end of the normal spot delivery due to a flap spot (FS) with a flap dose (FD), which has been investigated for carbon synchrotron but not for proton delivery.

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Article Synopsis
  • Bryant-Li-Bhoj syndrome (BLBS) is a genetic disorder linked to mutations in the H3F3A and H3F3B genes, leading to developmental issues and physical abnormalities.
  • A Japanese patient was identified with a new variant (p.A48G) in the H3F3A gene, showcasing additional symptoms not previously associated with BLBS, specifically neonatal myoclonus.
  • This case expands our understanding of the range of symptoms associated with BLBS, highlighting the variability in how the syndrome can manifest.
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This study aimed to evaluate the ability of serial whole-body dynamic PET/CT to differentiate physiological from abnormal F-FDG uptake in the abdomen and pelvis of gynecological cancer patients. We conducted a retrospective study of 61 F-FDG PET/CT examinations for suspected gynecological malignancies or metastases between March 2018 and January 2020. Our protocol included four-phase dynamic whole-body scans.

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Article Synopsis
  • - The study investigates the effectiveness of splenic artery embolization (SAE) as a treatment for esophageal variceal bleeding caused by portal hypertension (PH), focusing on its efficacy, safety, and overall role in managing this condition.
  • - A systematic review and meta-analysis of 18 studies involving 531 patients found significant reductions in variceal bleeding after SAE, with 26% achieving complete resolution of varices and 78% showing improvement.
  • - The findings indicate that SAE is a safe procedure with low complication rates, effectively increasing platelet counts and reducing bleeding in patients with variceal bleeding due to PH.
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Interstitial lung disease (ILD) is a serious complication of connective tissue diseases (CTDs). The heterogeneity of ILDs reflects differences in pathogenesis among diseases. This study aimed to clarify the characteristics of CTD-ILDs via a detailed analysis of the bronchoalveolar lavage fluid (BALF) and blood immune cells.

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Purpose: To assess the technical and clinical outcomes of percutaneous embolization for high-flow mesenteric vein to gonadal vein (MGV) portosystemic shunts.

Methods: In this HIPPA-compliant, review board-approved study, patients who underwent embolization of MGV shunts between 2011 and 2023 were included. Patient demographic data, embolization technique, clinical outcomes, and complications were retrieved from the electronic health records.

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Article Synopsis
  • Patients with refractory ascites from portal hypertension often struggle with traditional treatments like large-volume paracentesis (LVP) and may not be suitable candidates for TIPS or liver transplants, prompting interest in proximal splenic artery embolization (PSAE) as a new option.
  • A study of ten patients who underwent PSAE showed significant reductions in both the number of paracentesis sessions and the volume of fluid drained, highlighting the potential for this procedure to improve patient outcomes.
  • Over a 12-month follow-up, 60% of participants became independent from large-volume paracentesis, suggesting that PSAE could be a viable alternative for managing refractory ascites in selected patients.
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Background And Purpose: Traumatic brain injury (TBI) is a major source of health loss and disability worldwide. Accurate and timely diagnosis of TBI is critical for appropriate treatment and management of the condition. Neuroimaging plays a crucial role in the diagnosis and characterization of TBI.

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Background/aim: Endoscopic submucosal dissection (ESD) followed by chemoradiotherapy (CRT) has become a promising treatment modality in the management of early-stage superficial esophageal squamous cell carcinoma (SESCC). However, radiotherapy often leads to significant adverse events (AEs), including cardiopulmonary toxicity, limiting the delivery of this treatment modality. This study aimed to evaluate the efficacy of reduced-volume radiotherapy and dose-dense chemotherapy in mitigating AEs for high-risk SESCC following ESD.

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Background This study was aimed at analyzing the impact of postoperative radiotherapy (PORT) after breast-conserving surgery (BCS) on Japanese patients with early-stage breast cancer and exploring the potential of PORT omission. Materials and methods Data from 794 patients with early-stage breast cancer (T1-2, N0-1), who underwent BCS with (n = 310) or without PORT (n = 484) were retrospectively analyzed. Local control (LC) rate and breast cancer-specific survival (BCSS) were compared between the groups that received and did not receive PORT in the whole cohort and low-risk cohort (i.

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Article Synopsis
  • A case of transient global amnesia occurred after administering a non-ionic iodinated contrast agent for an abdominal CT scan.
  • Follow-up MRI scans showed signs of hippocampal microinfarction and temporary cerebral vasospasm.
  • This is the first documented case highlighting the risk of arterial vasospasm related to intravenous iodinated contrast, emphasizing the need for caution among medical professionals.
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Article Synopsis
  • * Researchers analyzed data from 404 participants aged 65 and older, using brain CT scans, blood tests, and cognitive assessments to evaluate calcification levels.
  • * Findings suggest distinct mechanisms behind calcification in different brain areas, particularly noting that male gender and intact parathyroid hormone levels are linked to specific regions, while age and lifestyle diseases are more general predictors.
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Advances in fluorescence microscopy and tissue-clearing have revolutionised 3D imaging of fluorescently labelled tissues, organs and embryos. However, the complexity and high cost of existing software and computing solutions limit their widespread adoption, especially by researchers with limited resources. Here, we present Acto3D, an open-source software, designed to streamline the generation and analysis of high-resolution 3D images of targets labelled with multiple fluorescent probes.

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A traceless site-selective conjugation method, "AJICAP-M", was developed for native antibodies at sites using Fc-affinity peptides, focusing on Lys248 or Lys288. It produces antibody-drug conjugates (ADCs) with consistent drug-to-antibody ratios, enhanced stability, and simplified manufacturing. Comparative in vivo assessment demonstrated AJICAP-M's superior stability over traditional ADCs.

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We aimed to retrospectively review outcomes in patients with high-risk prostate cancer and a Gleason score ≤ 6 following modern radiotherapy. We analyzed the outcomes of 1374 patients who had undergone modern radiotherapy, comprising a high-risk low grade [HRLG] group (Gleason score ≤ 6; n = 94) and a high-risk high grade [HRHG] group (Gleason score ≥ 7, n = 1125). We included 955 patients who received brachytherapy with or without external beam radio-therapy (EBRT) and 264 who received modern EBRT (intensity-modulated radiotherapy [IMRT] or stereotactic body radiotherapy [SBRT]).

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The prognosis of patients with hepatocellular carcinoma (HCC) is closely related to their liver reserves. The Child-Pugh (CP) score has traditionally been used to evaluate this reserve, with CP Grade B (CP score ≥ 7) associated with a higher risk of radiation-induced liver disease after stereotactic body radiation therapy (SBRT). However, the CP score has limitations, as it does not accurately assess liver reserve capacity.

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Purpose: This study was performed to investigate the effectiveness of hydrodissection during computed tomography-guided renal cryoablation by evaluation of the fluid distribution based on the retroperitoneal anatomy with the interfascial plane.

Materials And Methods: Between March 2014 and March 2021, 52 renal tumors were treated by cryoablation with hydrodissection (36 men; mean age 72.5 years).

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White matter pathways, typically studied with diffusion tensor imaging (DTI), have been implicated in the neurobiology of obsessive-compulsive disorder (OCD). However, due to limited sample sizes and the predominance of single-site studies, the generalizability of OCD classification based on diffusion white matter estimates remains unclear. Here, we tested classification accuracy using the largest OCD DTI dataset to date, involving 1336 adult participants (690 OCD patients and 646 healthy controls) and 317 pediatric participants (175 OCD patients and 142 healthy controls) from 18 international sites within the ENIGMA OCD Working Group.

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Background: Transmesenteric access for portal vein reconstruction and transjugular intrahepatic portosystemic shunt allows for intervention in patients with unfavorable anatomy and can be performed via multiple methods but may be difficult to obtain in patients with complex anatomy.

Case Presentation: We present a case report describing a method of obtaining transmesenteric access in the porta hepatis to facilitate direct intrahepatic portosystemic shunt creation in a young patient with recurrent variceal bleeding. This patient anatomy was unfavorable, and initially he was thought to be a poor candidate for any intervention, but this technique allowed for successful decompression of the varices safely and effectively.

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