Publications by authors named "Shinichiro Kumita"

Objectives: We assessed the diagnostic advantage of dual-energy computed tomography (DECT) over single-energy computed tomography (SECT) to evaluate lipiodol accumulation in target lesions following transcatheter arterial chemoembolization (TACE).

Methods: TACE was performed in 10 rabbits in whom the VX2 tumor was implanted in their left liver lobes. The miriplatin-lipiodol mixture was injected into the common hepatic artery.

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Background: Spontaneous isolated visceral artery dissection (SIVAD) is rare. Recently, appropriate treatment strategies for symptomatic SIVAD have been proposed. We aimed to determine the management of asymptomatic spontaneous isolated superior mesenteric artery dissection (ASISMAD), which is relatively frequently encountered in SIVAD.

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  • - This study aimed to compare the safety and effectiveness of two embolization methods (nBCA-ethiodized oil [NE] and nBCA-ethiodized oil-ethanol [NEE]) for treating Type II endoleak (T2EL) after endovascular aortic repair, involving 24 patients across 49 procedures.
  • - Follow-up revealed that while both methods had no serious adverse events, the NEE group had better outcomes, showing 87.5% freedom from sac enlargement and 100% freedom from reintervention at 1 year, compared to 65.0% and 69.2% in the NE group, respectively.
  • - The findings suggest that the N
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  • The study investigates whether preemptive embolization of side branch arteries from the abdominal aortic aneurysm sac can lead to early shrinkage of the aneurysm after endovascular repair.
  • Results showed that the embolization group had a significantly higher occlusion rate of side branch arteries and a lower frequency of type 2 endoleaks compared to the nonembolization group over a 24-month follow-up.
  • Additionally, patients in the embolization group were more likely to experience a reduction in aneurysm sac diameter of over 5 mm, suggesting that preemptive embolization may be beneficial for aneurysm treatment.
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  • Actinomycosis is a rare, chronic infectious disease often misdiagnosed as cancer, leading to surgical biopsies, especially in chest cases.
  • A 62-year-old man exhibited symptoms like fever and difficulty breathing, with imaging revealing a suspicious mass in his chest, which raised concerns for malignancy.
  • Despite initial biopsies not confirming cancer, testing ultimately identified actinomycetes, and the patient improved significantly after antibiotic treatment.
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Acute kidney injury (AKI) requiring continuous renal replacement therapy (CRRT), secondary to cardiovascular disease and sepsis, is associated with high in-hospital mortality. Although studies have examined cardiovascular disease and sepsis in AKI, the association between AKI and hepatic functional impairment remains unclear. We hypothesized that hepatic function markers would predict mortality in patients undergoing CRRT.

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  • The study introduces "System-F," a device designed to effectively deliver vascular plugs to aortic side branches during endovascular aneurysm repair (EVAR).
  • It features a combination of specialized sheaths and a guidewire that allows for multidimensional movement, facilitating precise placement of vascular plugs in various arteries.
  • The results showed no occurrences of type II endoleak in the 7 cases treated, suggesting that System-F could enhance pre-EVAR embolization strategies and improve clinical outcomes.
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Background: Radiographic detection of the Adamkiewicz artery (AKA) before aortic surgery helps to avoid spinal cord ischemia (SCI). We applied magnetic resonance angiography (MRA) using gadolinium enhancement (Gd-MRA) by means of the slow-infusion method with sequential k-space filling and compared AKA detectability with that of computed tomography angiography (CTA).

Methods: A total of 63 patients with thoracic or thoracoabdominal aortic disease (30 with aortic dissection [AD] and 33 with aortic aneurysm) who underwent both CTA and Gd-MRA to detect AKA were evaluated.

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Standard non-invasive methods for diagnosing and selecting the best treatment for osteomyelitis in patients with multiple chronic conditions remain to be established. We aimed to evaluate the ability of quantitative Ga-citrate single-photon emission computed tomography ( Ga-SPECT/CT) to determine the indication for either non-surgical treatment or osteotomy in patients with lower-limb osteomyelitis (LLOM) associated with diabetes mellitus and lower-extremity ischemia, based on monitoring of inflammatory activity in bone tissue. This single-centre prospective study conducted from January 2012 to July 2017 included 90 consecutive patients with suspected LLOM.

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Background: Although coronary artery disease (CAD) is characterized by epicardial atherosclerosis and microvascular disease, the importance of evaluating microvascular dysfunction has not been sufficiently recognized in clinical practice. We estimated microvascular disease severity by assessing hyperemic microvascular resistance (MVR), as determined by absolute quantification of myocardial blood flow (MBF) with N-ammonia positron emission tomography-myocardial perfusion imaging (PET-MPI).

Methods: We retrospectively collected data for 23 CAD patients who underwent both stress/rest PET-MPI and invasive coronary angiography (CAG) with fractional flow reserve (FFR) measurement.

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Perineural spread (PNS) from pelvic carcinoma has been regarded as a pathway to muscle and bone metastasis. However, few cases have been reported, especially in patients with bladder carcinoma. In the present report, we discuss a case of diffuse cancer involvement in the muscle 5 years after radical cystectomy for advanced bladder carcinoma.

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Purpose: Completely occlusive acute-subacute portal and mesenteric vein thrombosis (PVMVT) with severe complications is fatal. Endovascular treatments (EVTs) of acute-subacute PVMVT are not standardized. Thrombectomy combined with continuous catheter-directed thrombolysis is considered an effective treatment.

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Purpose: The turbulent kinetic energy (TKE) estimation based on 4D flow MRI has been currently developed and can be used to estimate the pressure gradient. The objective of this study was to validate the clinical value of 4D flow-based TKE measurement in patients with hypertrophic cardiomyopathy (HCM).

Methods: From April 2018 to March 2019, we recruited 28 patients with HCM.

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Background: Patients with lower-limb osteomyelitis (LLOM) may experience major adverse events, such as lower-leg amputations or death; therefore, early diagnosis and risk stratification are essential to improve outcomes. Ga-scintigraphy is commonly used for diagnosing inflammatory diseases. Although the diagnostic performance of planar and SPECT imaging for localized lesions is limited, SPECT/CT, which simultaneously acquires functional and anatomical definition, has resulted in significant improvements to diagnostic confidence.

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Sustained ventricular tachycardia (sVT), leading to sudden cardiac death, is one of the common manifestations in cardiac sarcoidosis (CS). Although late gadolinium enhancement (LGE) on cardiac magnetic resonance (CMR) has been reported to be associated with sVT, the relationships of its localization to sVT have not been fully evaluated.To evaluate the localization of LGE and its relationships to sVT in patients with CS, we reviewed medical record of consecutive 31 patients with CS who underwent CMR.

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Background: Acute portal vein thrombosis (PVT) with bowel necrosis is a fatal condition with a 50%-75% mortality rate. This report describes the successful endovascular treatment (EVT) of two patients with severe PVT.

Case Summary: The first patient was a 22-year-old man who presented with abdominal pain lasting 3 d.

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Background: A congenital intrahepatic portosystemic shunt (IPSVS) is a rare vascular abnormality that is characterized by an anomalous intrahepatic venous tract that connects the intrahepatic portal vein with the hepatic venous system. Hepatic encephalopathy is an indication for IPSVS embolization, which is technically challenging because rapid blood flow through shunts can induce the migration of embolization material to systemic veins. This case report discusses the efficacy of percutaneous balloon-occluded retrograde transvenous obliteration for treating patients with IPSVSs.

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Purpose: To investigate the reproducibility of tracer uptake measurements, including volume metrics, such as metabolic tumor volume (MTV) and tumor lesion glycolysis (TLG) obtained by TOF-PET-CT and TOF-PET-MR.

Materials And Methods: Eighty consecutive patients with different oncologic diagnoses underwent TOF-PET-CT (Discovery 690; GE Healthcare) and TOF-PET-MR (SIGNA PET-MR; GE Healthcare) on the same day with single dose-18F-FDG injection. The scan order, PET-CT following or followed by PET-MR, was randomly assigned.

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Coronary peripheral circulatory disturbances in the remote stage of Kawasaki disease have been reported. In this study, of the 50 patients in the remote stage of Kawasaki disease who underwent coronary perfusion evaluation using adenosine-loaded N-ammonia positron emission tomography, 28 patients who did not have stenosis of ≥75% in the left coronary artery underwent an evaluation for myocardial flow reserve (MFR) of the left anterior descending artery (LAD) and left circumflex artery (LCx). Clinical findings were compared between patients with normal (≥2.

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Most cardiac diseases cause a non-physiological blood flow pattern known as turbulence around the heart and great vessels, which further worsen the disease itself. However, there is no consensus on how blood flow can be defined in disease conditions. Especially, in the left atrium, the fact that vortex flow already exists makes this debate more complicated.

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Background: The goals of neoadjuvant systemic therapy (NST) are to reduce tumor volume and to provide a prognostic indicator in assessing treatment response. Digital breast tomosynthesis (DBT) was developed and has increased interest in clinical settings due to its higher sensitivity for breast cancer detection compared to full-field digital mammography (FFDM).

Purpose: To evaluate the accuracy of DBT in assessing response to NST compared to FFDM, ultrasound (US), and magnetic resonance imaging (MRI) in breast cancer patients.

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  • A study evaluated the effectiveness and safety of the Viabahn stent graft in emergency endovascular treatment for upper and lower extremity arterial bleeding in patients from January 2017 to August 2021.
  • The results showed a 100% success rate for both technical and clinical outcomes, with no reported limb ischemia or serious complications, though the 30-day mortality was 22.7%.
  • Follow-up indicated no instances of rebleeding or endoleaks, but two graft occlusions occurred without limb ischemia.
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