Publications by authors named "S Hayakawa"
Ruptured iliac artery aneurysms are serious conditions with high mortality, occasionally perforating into the venous system. A 73-year-old male presented with left leg edema and a pulsatile left lower abdominal mass. Computed tomography revealed a ruptured left common iliac artery aneurysm with perforation into the left common iliac vein.
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- A study analyzed 1,625 stool samples from children with diarrhea in Japan over four years (2018-2022) to detect human astroviruses (HAstVs) and other diarrheal viruses, finding HAstV in 8.6% of samples.
- The prevalence of HAstVs varied by year, with a notable increase to 20.1% in 2021-2022, and a significant infection rate was observed in children aged 1-3 years.
- The study identified multiple HAstV genotypes, including outbreaks of HAstV1 and MLB2 during the COVID-19 pandemic, and noted for the first time a mixed infection of HAstV1 and MLB1.
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- Cancerous tissues absorb significantly more glucose than normal tissues, prompting the development of a gadobutrol-glucose contrast solution for improved MRI imaging of tumors.
- The contrast medium was successfully mixed, tested on VX7 cancerous rabbits, and showed increased signal intensity after vein infusion compared to a gadobutrol-saline solution.
- The use of the gadobutrol-glucose solution effectively enhanced the visualization of the cancerous regions in the MRI scans, indicating its potential for better cancer imaging.
Ovarian cancer (OvCa) is one of the most lethal gynecological malignancies, and most patients are diagnosed at advanced stage with peritoneal dissemination. Although age at diagnosis is considered an independent prognostic factor, its impact on peritoneal recurrence after combined cytoreductive surgery and chemotherapy is not clear. The objective of this study was to investigate the impact of aging on peritoneal recurrence from stealth dissemination and gain insight of the pathophysiology of OvCa in elderly patients.
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- Sapovirus (SaV) infections are on the rise globally, with a notable increase in Japan from 2010 to 2022, mainly due to the GI.1 genotype.
- The study analyzed 15 SaV GI.1 outbreak strains using next-generation sequencing and found distinct clustering in lineages and specific amino acid substitutions in their genomes.
- Key mutations associated with the pathogenicity and spread of SaV were identified in strains responsible for the largest outbreak in Japan (2021-2022), enriching the understanding of SaV's genetic makeup.