Publications by authors named "Keigo Chosa"

Article Synopsis
  • A study examined the clinical outcomes of patients with blunt splenic injuries who received transarterial embolization (TAE), focusing on their hemodynamic status (stable vs unstable).
  • The research analyzed data from 38 adult patients treated at two centers from 2011 to 2022, comparing the survival rates, rebleeding incidents, and need for splenectomy between hemodynamically stable (HDS) and unstable (HDU) groups.
  • Results showed a high survival discharge rate for both groups (88.2% in HDU and 100% in HDS), but highlighted the need for more studies to assess the effectiveness of TAE compared to traditional surgery for HDU patients.
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  • The study developed a deep learning algorithm using CT images of the vertebral column to improve age estimation of cadavers, especially for elderly cases where traditional methods fall short.
  • This algorithm was trained on 1,120 CT scans from 140 patients over eight age decades and was tested on 219 cadavers, yielding a mean difference of only 0.30 years between known and estimated ages.
  • Results showed high accuracy (ICC of 0.96) and minimal errors, proving this method to be significantly better than conventional age estimation techniques.
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Background Small tumors in liver cirrhosis are difficult to distinguish using intraoperative ultrasonography. In addition, preoperative chemotherapy for metastatic liver cancer may diminish tumor size, thus making tumors difficult to identify intraoperatively. To address such difficulties, we devised a method to mark liver tumors preoperatively to facilitate intraoperative identification.

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  • - The study examined how proximal splenic artery embolization (SAE) affects cirrhotic patients with enlarged spleens who need surgery, focusing on changes in portal vein size, spleen volume, and platelet counts.
  • - Eight cirrhotic patients underwent SAE either before or after surgery, and results showed a significant decrease in both portal vein diameter and spleen volume, along with a notable increase in platelet counts post-embolization.
  • - The findings suggest that performing proximal SAE could safely help manage hypersplenism and lower surgical risks for cirrhotic patients with splenomegaly.
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Introduction: Small liver tumours are difficult to identify during hepatectomy, which prevents curative tumour excision. Preoperative marking is a standard practice for small, deep-seated tumours in other solid organs; however, its effectiveness for liver tumours has not been validated. The objective of this study is to evaluate the effectiveness of preoperative markings for curative resection of small liver tumours.

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We report a rare patient with portal hypertension who presented with esophageal- and gastric varices and refractory ascites due to hepatic arterioportal fistulas. Treatment by transportal scleroembolization using ethanolamine oleate and coils were successful. Pretreatment hepatofugal flow subsequently changed to hepatopetal flow and the symptoms of portal hypertension improved.

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Article Synopsis
  • Deep learning-based spectral CT imaging (DL-SCTI) enhances image quality by using advanced networks to fill in missing data and improve visual accuracy for dual-energy scans.
  • A clinical study involving 52 patients with hypervascular hepatocellular carcinoma (HCC) found that DL-SCTI-generated iodine maps significantly improved the contrast-to-noise ratio (CNR) during the hepatic arterial phase compared to standard 70 keV images.
  • While DL-SCTI effectively detects HCCs, it may underestimate iodine concentration in small lesions or lower concentrations, indicating limitations in certain scenarios.
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Background: Balloon-occluded retrograde transvenous obliteration (BRTO) is a treatment option for patients with gastric varices (GVs). This study aimed to clarify the clinical significance of portal hypertension estimated by the hepatic venous pressure gradient (HVPG), subsequent exacerbation of esophageal varices (EVs), and prognosis of patients who underwent BRTO for GVs.

Methods: Thirty-six patients with GVs treated with BRTO were enrolled in this study, and their HVPG was measured before (pre-HVPG) and on the day after BRTO (post-HVPG).

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Article Synopsis
  • * Computed tomography (CT) plays a crucial role in diagnosing bowel ischemia and identifying its causes, which include small bowel obstruction and various forms of mesenteric ischemia.
  • * Understanding the CT findings and their clinical significance is essential for making informed treatment decisions based on the specific underlying mechanisms of bowel ischemia.
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Background: Patients with hepatocellular carcinoma (HCC) and macrovascular invasion (MVI) who receive systemic chemotherapy have a poor prognosis. This study aimed to determine if one-shot cisplatin (CDDP) chemotherapy via hepatic arterial infusion (HAI) combined with radiation therapy (RT) prior to systemic chemotherapy could improve the outcomes of these patients.

Methods: This study consisted of 32 HCC patients with the following eligibility criteria: (i) portal vein invasion 3/4 and/or hepatic vein invasion 2/3; (ii) received one-shot CDDP via HAI; (iii) received RT for MVI, (iv) a Child-Pugh score ≤ 7; and (v) an Eastern Clinical Oncology Group Performance Status score of 0 or 1.

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  • CT-guided percutaneous drainage is a safe method for treating pelvic abscesses, but it has limitations regarding the needle's direction.
  • An innovative technique was developed to perform cranio-caudal punctures under CT fluoroscopy, allowing precise control of the needle's movement.
  • This new approach successfully addressed the drainage of an abscess in an 82-year-old man, enhancing treatment options for challenging cases.*
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Introduction: We evaluated the safety margin in patients with hepatocellular carcinoma (HCC) in the hepatic dome who underwent computed tomography (CT)- or ultrasound (US)-guided radiofrequency ablation (RFA).

Material And Methods: Included in this single-center study were 46 patients with 56 HCCs in the hepatic dome undergoing RFA after transarterial chemoembolization from January 2009 to December 2016. Thirty were addressed with CT fluoroscopy and 26 with US guidance.

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Background: Liver cysts are common, with most cases being asymptomatic. In symptomatic cases, the disease is amenable to treatment. However, huge or multiple liver cysts with vascular narrowing and associated systemic symptoms are extremely rare.

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The overall survival of patients with advanced hepatocellular carcinoma with tumor thrombosis of the main trunk or bilobar branches of the portal vein is extremely poor. Moreover, there is no standard treatment established for the condition. Herein, we present the case of a 65-year-old man who were treated the patient with hepatic arterial infusion chemotherapy, radiation therapy for tumor thrombosis, portal vein stent placement, lenvatinib administration, and renal venous shunt embolization.

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Background: Overall survival of patients with advanced hepatocellular carcinoma (HCC) with Vp4 (tumor thrombosis of the main trunk or bilobar of the portal vein) is extremely poor.

Purpose: The purpose of this study is to clarify the prognosis of hepatic arterial infusion chemotherapy (HAIC) combined with radiation therapy (RT) for advanced HCC with Vp4 and to analyze the factors that contribute to the prognosis.

Methods: In this retrospective cohort study, 51 HCC patients who were treated with HAIC and RT for portal vein tumor thrombosis and met the following criteria were enrolled: (i) with Vp4; (ii) Child-Pugh score of 5-7; (iii) Eastern Cooperative Oncology Group performance status of 0 or 1; (iv) no history of systemic therapy; and (v) from September 2004 to April 2019.

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Hepatic encephalopathy that occurs long after liver transplantation (LT) is an uncommon condition. Here, we describe the successful case of a 65-year-old patient who underwent interventional radiology (IVR) using a transmesenteric approach under minilaparotomy for hepatic encephalopathy because of a portosystemic shunt 11 years after ABO-incompatible living donor LT with splenectomy. Enhanced computed tomography confirmed a huge portosystemic shunt and left gastric vein (LGV)-esophageal-azygos vein, which was not treated during LT.

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Bronchial artery aneurysms (BAA) are a rare but potentially life-threatening complications because of the massive hemothorax or hemoptysis that occurs with ruptures. A 79-year-old woman was transferred to our hospital because of the sudden onset of back pain, syncope, and subsequent hypotension. Computed tomography showed a left BAA with bilateral hemothorax and hemomediastinum.

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Purpose: We evaluated the usefulness of the Amplatzer vascular plug (AVP) for preoperative embolization before distal pancreatectomy with en bloc celiac axis resection (DP-CAR).

Materials And Methods: Between April 2010 and September 2017, 19 patients with locally advanced pancreatic body cancer underwent preoperative embolization of the common hepatic and the left gastric artery (CHA, LGA) with AVP or coils. We compared the embolization success rate, embolization-related complications, the time required for preoperative embolization before DP-CAR and the procedure costs in patients whose CHA was AVP- (n = 7) or coil (n = 12) embolized.

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Aim: This study aimed to retrospectively determine the feasibility and safety of computed tomography (CT)-guided intrathoracic and bone re-biopsy for patients with non-small cell lung cancer (NSCLC).

Materials And Methods: Seventeen patients underwent CT-guided intrathoracic or bone re-biopsy for the determination of epidermal growth factor receptor (EGFR) T790M mutation and/or programmed cell death-ligand 1 (PD-L1) expression. The characteristics of each lesion, success rate of analyses, and complications were investigated.

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Purpose: To identify factors benefiting from computed tomography during hepatic arteriography (CTHA) in addition to dynamic CT studies at the preoperative evaluation of the hypervascularity of hepatocellular carcinoma (HCC).

Materials And Methods: We retrospectively divided 45 patients with HCC, who underwent both dynamic CT (dCT) and CTHA, into two groups based on the number of hypervascular HCCs identified on dCT and CTHA studies. In group A, the number of HCCs identified by dCT and CTHA was the same and additive CTHA had not been indicated.

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Purpose: The aim of this study was to investigate the incidence and timing of subsequent fractures in patients treated with and without percutaneous vertebroplasty (PVP).

Materials And Methods: We reviewed 794 patients who underwent 1500 PVPs with polymethylmethacrylate (PMMA) at our institution between January 1999 and December 2009. We also reviewed 349 patients with vertebral fractures who underwent conservative treatment without PVP between October 1999 and December 2009 and compared the incidence and timing of subsequent fractures in the two groups.

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