Radiation medicine
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A patient who received radiation therapy for a sacral lesion 10 years ago and eventually developed dedifferentiated chordoma at the primary site is reported. Initially, the patient received 54 Gy with Co-60 to the sacral tumor, and 6 years later an additional 50 Gy with 10 MV X-rays to the local recurrence. Four years later, an evident sacral tumor was noticed. ⋯ The patient eventually died of progressive disease with incidental aspiration pneumonia. At autopsy, 10 years after the initial treatment, the recurrent sacral tumor proved to be dedifferentiated chordoma accompanied by typical chordoma. Although this case suggests the possible malignant transformation of chordoma rather than collision, the factors inducing this change remain unknown.
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Case Reports
Penetrating injury of the vertebral artery caused by a nail gun: preoperative embolization.
We describe a penetrating injury of the vertebral artery caused by a nail gun. The artery was preoperatively embolized using mechanical detachable coils (MDC).
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The purpose of this study was to determine whether or not the vertebral flow of patients with vertigo and normal brain magnetic resonance (MR) images was decreased in comparison with normal controls. ⋯ In this study, the majority of patients had normal CBF. This method is clinically useful for estimating CBF.
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Case Reports
A case of cerebral air embolism predominant in the left cerebral hemisphere following subclavian catheterization.
We report a case of cerebral air embolism caused by right subclavian vein catheterization. A large amount of air was seen only over the left cerebral hemisphere on computed tomographic (CT) scans. Although neurological deficit was observed bilaterally at the onset, the degree of ischemic brain damage was far greater in the left cerebral hemisphere than in the right. This unusual left-sided predominancy of cerebral air embolism was presumably due to the tortuosity of the ascending aorta.
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Comparative Study
Rapid MR imaging of the liver: comparison of twelve techniques for single breath-hold whole volume acquisition.
Twelve magnetic resonance imaging pulse sequences for single breath-hold whole volume acquisition of the liver were evaluated on volunteers. Liver and spleen contrast to noise ratio (C/N), overall image quality, and grade of artifacts were compared. ⋯ In the qualitative evaluation, DE-prepFGR, and single and multi-shot SE-EPI-mT2 had good results, as did FSE and FSE + FS. Further studies should be conducted to determine whether or not these breath-hold sequences can obviate current conventional non-breath-hold sequences.