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Permanent URI for this collectionhttps://hdl.handle.net/11443/932

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Subject: search.filters.subject.Magnetic resonance imaging

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Now showing 1 - 6 of 6
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    Solving the preoperative breast MRI conundrum: design and protocol of the MIPA study
    (SPRINGER, 2020-01-01) Sardanelli, Francesco; Trimboli, Rubina M.; Houssami, Nehmat; Gilbert, Fiona J.; Helbich, Thomas H.; Alvarez Benito, Marina; Balleyguier, Corinne; Bazzocchi, Massimo; Bult, Peter; Calabrese, Massimo; Camps Herrero, Julia; Cartia, Francesco; Cassano, Enrico; Clauser, Paola; de Andrade, Danubia A.; de Lima Docema, Marcos F.; Depretto, Catherine; Forrai, Gabor; Girometti, Rossano; Harms, Steven E.; Hilborne, Sarah; Ienzi, Raffaele; Lobbes, Marc B. I.; Losio, Claudio; Mann, Ritse M.; Montemezzi, Stefania; Obdeijn, Inge-Marie; Ozcan, Umit Aksoy; Pediconi, Federica; Preibsch, Heike; Raya-Povedano, Jose L.; Sacchetto, Daniela; Scaperrotta, Gianfranco P.; Schlooz, Margrethe; Szabo, Botond K.; Ulus, Ozden S.; Taylor, Donna B.; Van Goethem, Mireille; Veltman, Jeroen; Weigel, Stefanie; Wenkel, Evelyn; Zuiani, Chiara; Di Leo, Giovanni
    Despite its high diagnostic performance, the use of breast MRI in the preoperative setting is controversial. It has the potential for personalized surgical management in breast cancer patients, but two of three randomized controlled trials did not show results in favor of its introduction for assessing the disease extent before surgery. Meta-analyses showed a higher mastectomy rate in women undergoing preoperative MRI compared to those who do not. Nevertheless, preoperative breast MRI is increasingly used and a survey from the American Society of Breast Surgeons showed that 41\% of respondents ask for it in daily practice. In this context, a large-scale observational multicenter international prospective analysis (MIPA study) was proposed under the guidance of the European Network for the Assessment of Imaging in Medicine (EuroAIM). The aims were (1) to prospectively and systematically collect data on consecutive women with a newly diagnosed breast cancer, not candidates for neoadjuvant therapy, who are offered or not offered breast MRI before surgery according to local practice
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    Magnetic resonance imaging before breast cancer surgery: results of an observational multicenter international prospective analysis (MIPA)
    (SPRINGER, 2022-01-01) Sardanelli, Francesco; Trimboli, Rubina M.; Houssami, Nehmat; Gilbert, Fiona J.; Helbich, Thomas H.; Alvarez Benito, Marina; Balleyguier, Corinne; Bazzocchi, Massimo; Bult, Peter; Calabrese, Massimo; Camps Herrero, Julia; Cartia, Francesco; Cassano, Enrico; Clauser, Paola; Cozzi, Andrea; de Andrade, Danubia A.; de Lima Docema, Marcos F.; Depretto, Catherine; Dominelli, Valeria; Forrai, Gabor; Girometti, Rossano; Harms, Steven E.; Hilborne, Sarah; Ienzi, Raffaele; Lobbes I, Marc B.; Losio, Claudio; Mann, Ritse M.; Montemezzi, Stefania; Obdeijn, Inge-Marie; Ozcan, Umit A.; Pediconi, Federica; Pinker, Katja; Preibsch, Heike; Raya Povedano, Jose L.; Sacchetto, Daniela; Scaperrotta, Gianfranco P.; Schiaffino, Simone; Schlooz, Margrethe; Szabo, Botond K.; Taylor, Donna B.; Ulus, Ozden S.; Van Goethem, Mireille; Veltman, Jeroen; Weigel, Stefanie; Wenkel, Evelyn; Zuiani, Chiara; Di Leo, Giovanni
    Objectives Preoperative breast magnetic resonance imaging (MRI) can inform surgical planning but might cause overtreatment by increasing the mastectomy rate. The Multicenter International Prospective Analysis (MIPA) study investigated this controversial issue. Methods This observational study enrolled women aged 18-80 years with biopsy-proven breast cancer, who underwent MRI in addition to conventional imaging (mammography and/or breast ultrasonography) or conventional imaging alone before surgery as routine practice at 27 centers. Exclusion criteria included planned neoadjuvant therapy, pregnancy, personal history of any cancer, and distant metastases. Results Of 5896 analyzed patients, 2763 (46.9\%) had conventional imaging only (noMRI group), and 3133 (53.1\%) underwent MRI that was performed for diagnosis, screening, or unknown purposes in 692/3133 women (22.1\%), with preoperative intent in 2441/3133 women (77.9\%, MRI group). Patients in the MRI group were younger, had denser breasts, more cancers >= 20 mm, and a higher rate of invasive lobular histology than patients who underwent conventional imaging alone (p < 0.001 for all comparisons). Mastectomy was planned based on conventional imaging in 22.4\% (MRI group) versus 14.4\% (noMRI group) (p < 0.001). The additional planned mastectomy rate in the MRI group was 11.3\%. The overall performed first- plus second-line mastectomy rate was 36.3\% (MRI group) versus 18.0\% (noMRI group) (p < 0.001). In women receiving conserving surgery, MRI group had a significantly lower reoperation rate (8.5\% versus 11.7\%, p < 0.001). Conclusions Clinicians requested breast MRI for women with a higher a priori probability of receiving mastectomy. MRI was associated with 11.3\% more mastectomies, and with 3.2\% fewer reoperations in the breast conservation subgroup.
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    Tonsillar Plasmacytoma: clues on magnetic resonance imaging
    (BIOMED CENTRAL LTD, 2018-01-01) Celebi, Irfan; Bozkurt, Gulpembe; Polat, Nedim
    Background: Malignant plasma cell proliferation may present as a disseminated disease (multiple myeloma), a solitary plasmacytoma of bone, or an extramedullary plasmacytoma of soft tissue. The latter plasmacytomas represent approximately 3\% of all plasma cell proliferations, and 80\% develop in the head-and-neck region. The unexpected clinical presentation of such masses may be present. Case presentation: Here, we report a rare case of primary tonsillar plasmacytoma in a 42-year-old female. The patient presented with asymmetric tonsillar hypertrophy that was resistant to antibiotherapy. Upon further workup, we found no evidence of multiple myeloma or light-chain disease. The patient underwent surgery and, at the last follow-up, exhibited no evidence of such disease. Conclusions: In adults presenting with asymptomatic tonsillar enlargement, the possibility of submucosal masses should be considered, thus encouraging the radiologist to evaluate crypts within the palatine tonsil on a postcontrast MRI, besides enlargement and signal change.
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    Complementary Specific Pelvic Sequences on Routine Lumbar Magnetic Resonance Imaging Scans: An Imaging-Based Study Focused on Piriformis Syndrome
    (TURKISH NEUROSURGICAL SOC, 2019-01-01) Ayhan, Selim; Nabiyev, Vugar Nabi; Yetisyigit, Yasin; Palaoglu, Selcuk; Yorubulut, Mehmet
    AIM: To discuss the rationale and merit of specific pelvic sequences as an adjunct to routine lumbar magnetic resonance imaging (MRI) for early detection of piriformis syndrome (PS) and to disclose its frequency in patients who underwent radiological evaluation. MATERIAL and METHODS: This retrospective, imaging-based study included all individuals who underwent lumbar MRI and those who were further evaluated with a pelvic MRI, but excluded all high-energy trauma Cases. The patients' demographics and radiological features were reviewed using electronic patient records and hospital-based picture image archiving and communication system. RESULTS: Overall, 1321 individuals (659 females
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    Revisiting imaging features of rectosigmoid vascular malformation with emphasis on multiparametric MRI: a case report
    (SPRINGER, 2022-01-01) Erdemli, S.; Alis, D.; Cicek, B.; Goksel, S.; Karahasanoglu, T.; Karaarslan, E.
    Background: Gastrointestinal vascular malformations are rare benign vascular neoplasms of the gastrointestinal tract, with the rectosigmoid region being the most frequently involved site. Patients often manifest with recurrent, intermittent rectal bleeding, which might occasionally be life-threatening. Case presentation: A 39-year-old man with a history of hemorrhoid operations twice was presented to our gastroenterology department with blood in the stool and abdominal pain. After the colonoscopy, multiparametric MRI, and CT examinations, robotic low anterior resection was performed with the diagnosis of rectosigmoid venous malformation. The histopathological examination confirmed the diagnosis. Conclusion: Colonoscopy is the preferred method in diagnosing rectosigmoid vascular malformation, but wrong and delayed diagnoses are common.Thus, imaging modalities might add to colonoscopy in equivocal cases.
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    On using signal magnitude in diffusion magnetic resonance measurements of restricted motion
    (ELSEVIER SCIENCE INC, 2019-01-01) Ozcan, Alpay
    Tissue microstructure has significance as a biomarker, however its accurate inference with diffusion magnetic resonance (MR) is still an open problem. With few exceptions, diffusion weighted (DW) MR models either process diffusion MR data using signal magnitude, whereby microstructural information is forcefully confined to symmetry due to Fourier transform properties, or directly use symmetric basis expansions. Herein, information loss from magnitude utilization is demonstrated by numerically simulating particles undergoing diffusion near a fully reflective infinite wall and an orthogonal corner. Simulation results show that the loss of the Hermitian property when using signal magnitude impedes DW MR from accurately inferring microstructural information in both of the geometries.