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Now showing items 1 - 16 of 65087

  • The imaging appearances of metallosis

    Heffernan, E. J.   Alkubaidan, F. O.   Nielsen, T. O.   Munk, P. L.  

    Metallosis is an uncommon condition in which there is infiltration of periprosthetic soft tissues and bone by metallic debris resulting from wear of joint arthroplasties. It is often associated with significant osteolysis; therefore the identification of metallosis is an indication for revision arthroplasty. The radiographic, CT and MRI features of metallosis in a 63-year-old man who presented 16 years post-arthroplasty are described in this case report.
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  • Aggressive angiomyxoma of the thigh

    Heffernan, E. J.   Hayes, M. M.   Alkubaidan, F. O.   Clarkson, P. W.   Munk, P. L.  

    Aggressive angiomyxoma is a rare tumour that typically occurs in the perineum in women of reproductive age. A small number of cases occurring in men have been reported, all of which were located in the low pelvis, perineum or scrotum. While benign, the tumour is locally infiltrative and consequently has a high rate of local recurrence following surgery; therefore, accurate pre-operative diagnosis is important. The characteristic location of these tumours in the low pelvis or perineum has led to speculation that aggressive angiomyxomas arise from a mesenchymal cell that is unique to the perineum. We describe a case of aggressive angiomyxoma arising in the thigh of a 54-year-old man, which we believe is the first reported instance of this rare neoplasm occurring remote from the pelvis or perineum in a male patient. Cross-sectional imaging demonstrated a well-defined mass that had low density on CT and high intensity on fluid-sensitive MR sequences. Biopsy was non-diagnostic and excision was performed. At histological analysis, the tumour exhibited the characteristic features of aggressive angiomyxoma, with bland spindle cells and large, hyalinised blood vessels in a hypocellular myxoid matrix. Extensive immunohistochemical staining further supported the diagnosis. While the imaging features of these tumours are non-specific and suggestive of myxoid neoplasms, the diagnosis should be considered whenever biopsy of a myxoid-appearing mass yields hypocellular, non-diagnostic material, despite adequate sampling.
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  • Is diffusion-weighted MRI sufficient for follow-up of neuroendocrine tumour liver metastases?

    Lavelle, L. P.   O'Neill, A. C.   McMahon, C. J.   Cantwell, C. P.   Heffernan, E. J.   Malone, D. E.   Daly, L.   Skehan, S. J.  

    AIM: To assess if diffusion-weighted imaging (DWI) alone could be used for follow-up of neuroendocrine hepatic metastases. MATERIAL AND METHODS: This was a retrospective study, approved by the institutional review board. Twenty-two patients with neuroendocrine liver metastases who had undergone more than one liver magnetic resonance imaging (MRI) examination, (including DWI and using hepatocyte-specific contrast medium) were evaluated. Up to five metastases were measured at baseline and at each subsequent examination. The reference standard measurement was performed on the hepatocyte phase by one reader. Three independent readers separately measured the same lesions on DWI sequences alone, blinded to other sequences, and recorded the presence of any new lesions. RESULTS: The longest diameters of 317 liver metastases (91 on 22 baseline examinations and a further 226 measurements on follow-up) were measured on the reference standard by one reader and on three b-values by three other readers. The mean difference between DWI measurements and the reference standard measurement was between 0.01-0.08 cm over the nine reader/b-value combinations. Based on the width of the Bland and Altman interval containing approximately 95% of the differences between the reader observation and the mean of reference standard and DWI measurement, the narrowest interval over the nine reader/b-value combinations was -0.6 to +0.7 cm and the widest was -0.9 to 1 cm. In the evaluation of overall response using Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 criteria, the weighted kappa statistic was between 0.49 and 0.86, indicating moderate-to-good agreement between the reference standard and DWI. CONCLUSION: The visualisation and measurement of hepatic metastases using DWI alone are within acceptable limits for clinical use, allowing the use of this rapid technique to restage hepatic disease in patients with neuroendocrine metastases. (C) 2016 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.
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  • A comparative analysis of the occupational energy expenditure of radiologists versus clinicians

    Murphy, I. G.   Murphy, C. G.   Heffernan, E. J.  

    Sedentary lifestyles have been associated with increased morbidity and mortality. Radiology as a profession may be sedentary compared to some clinical disciplines. Our aim was to measure the occupation-related energy expenditure of a cohort of radiologists versus clinicians using a specialized pedometer. 25 radiologists and 25 clinicians (15 surgeons, 8 physicians and 2 emergency physicians) were measured. The amount of steps walked, stairs climbed and calories burned on a given day from 9 a.m. to 5 p.m. were compared between the groups. The difference in mean calorie usage per day was 320 greater, and steps walked per day 2,985 greater, in clinicians than in radiologists (p < 0.0001 for each). Such a difference in calorie intake can have significant long-term health implications in terms of increased weight or BMI. Means of combating this deficit are discussed.
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  • The Liturgy of the Medieval Churchby Thomas J. Heffernan; E. Ann Matter

    Review by: Neil J. Roy  

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  • The Liturgy of the Medieval Churchby Thomas J. Heffernan; E. Ann Matter

    Review by: Neil J. Roy  

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  • The Liturgy of the Medieval Churchby Thomas J. Heffernan; E. Ann Matter

    Review by: R. N. Swanson  

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  • The Passion of Perpetua and Felicity - By Thomas J. Heffernan

    George P. Carras  

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  • The Passion of Perpetua and Felicity by Thomas J. Heffernan (review)

    Tilley, Maureen A.  

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  • The Passion of Perpetua and Felicity by Thomas J. Heffernan (review)

    Tilley   Maureen A.  

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  • , by Sharon E. J. Gerstel

    Kostis Kourelis  

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  • Revisiting the e+e−→ K+K−J/ψ line shape

    Zhang, Jielei; Zhu, Tengjiao; He, Jinjin  

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  • Study of the rare decay J/ψ → e+e−*

    Xing-Dao Guo (郭星导)   Si-Run Xue (薛思润)   Hong-Wei Ke (柯红卫)   Xue-Qian Li (李学潜)   Qiang Zhao (赵强)  

    We study the decay process of J/ψ → e+e− where the relatively clean electromagnetic (EM) transitions appear at leading order at tree level while the hadronic contributions only emerge via hadronic loop transitions. We include the low-lying scalar f0(980) and pseudoscalar η/η' as the dominant contributions in the evaluation of the hadronic loop contributions. It is found that the hadronic effects are negligible compared with the EM contributions. The decay width of J/ψ → e+e− is determined to be about 2.12 × 10−6 keV if there is no other leading mechanism contributing. This result will be tested by the BESIII experiment with a large J/ψ data sample.
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  • J/psi -> e(+)e(-) decay selection criteria in the CBM

    Derenovskaya, O. Yu   Ivanov, V. V.  

    Currently the CBM experiment is being developed in GSI (Darmstadt, Germany) at the FAIR accelerator complex in an international collaboration with JINR (Dubna, Russia). Measurements of the J/psi -> e(+)e(-) decay are one of the key objectives of the CBM experiment, the registration of such decays is planned to be conducted in real-time experiment. In the current paper the criteria, that allow for effective selection of signal decay events for AuAu collisions at 10 AGeV, are discussed in detail. This energy corresponds to the first phase of the CBM experiment.
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  • Jordan Dalla J alla I (e ritorno)

    Brechenmacher   Frédéric  

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  • Jordan Dalla J alla I (e ritorno)

    Brechenmacher, Frédéric  

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