Acta radiologica open最新文献

{"title":"Lipomatous pseudohypertrophy of the pancreas mimicking liposarcoma: A case report.","authors":"Tomomi Kamimura, Takashi Katsube, Takeshi Nishi, Yasunari Kawabata, Yoshitsugu Tajima, Asuka Araki, Yasushi Kaji","doi":"10.1177/20584601241259847","DOIUrl":"10.1177/20584601241259847","url":null,"abstract":"<p><p>Lipomatous pseudohypertrophy of the pancreas (LPH) is a rare disease in which the pancreatic parenchyma is replaced with mature adipose tissue. It is an idiopathic condition whose diagnosis is made based on histopathological analyses. Herein, we report the case of a 50-year-old male patient with a lipomatous mass in the head of the pancreas on computed tomography for close examination of a renal tumor. We suspected liposarcoma, and laparotomy was performed. However, histological analyses revealed LPH. Several imaging findings of LPH can enable a noninvasive diagnosis and help its clinical approach.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 8","pages":"20584601241259847"},"PeriodicalIF":0.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11292700/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141876848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acute on chronic pancreatitis affecting the ectopic pancreas located in the jejunal mesentery: A case report.","authors":"Kazuya Okamura, Emi Ishibashi, Kazumi Araki, Yoshiko Kanasaki, Koji Kodama, Akiyoshi Kanazawa, Hideyuki Onuma","doi":"10.1177/20584601241269617","DOIUrl":"10.1177/20584601241269617","url":null,"abstract":"<p><p>Ectopic pancreas within the mesentery is rare. In this case report, a 61-year-old man with an ectopic pancreas within the jejunal mesentery for over 20 years developed chronic pancreatitis that progressed to acute exacerbation. Our computed tomography (CT) performed for acute abdomen assessment suggested acute appendicitis or Meckel's diverticulitis. However, a CT scan taken 20 years ago revealed a structure indicative of an ectopic pancreas in the mesentery, and further imaging findings taken 10 and 4 years ago confirmed progression to chronic pancreatitis. Furthermore, we found a pancreatic stone confined in the luminal structure that corresponded to the main pancreatic duct; this stone eventually caused acute exacerbation. In summary, we report a case of mesenteric ectopic pancreas that showed typical findings of progression and acute exacerbation of chronic pancreatitis on CT.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 8","pages":"20584601241269617"},"PeriodicalIF":0.9,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11289796/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141876847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Imaging finding of multiple myeloma presenting as soft-tissue disease mimicking extrapleural space tumors: A case report.","authors":"Hee Kang","doi":"10.1177/20584601241246105","DOIUrl":"10.1177/20584601241246105","url":null,"abstract":"<p><p>Extramedullary involvement of multiple myeloma is an uncommon and aggressive condition characterized by proliferation of monoclonal plasma cells located outside the bone marrow. This report describes the imaging findings of a patient who presented with continuous soft-tissue disease on the ribs, suspected as extrapleural space tumors on chest CT. The patient was diagnosed with multiple myeloma through surgical biopsy of the tumor and bone marrow.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 6","pages":"20584601241246105"},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11149450/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141247893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic resonance imaging in the second trimester as a complement to ultrasound for diagnosis of fetal anomalies.","authors":"Frida Cederlund, Ove Axelsson, Sara Desmond, Hashem Amini, Johan Wikström","doi":"10.1177/20584601241248820","DOIUrl":"10.1177/20584601241248820","url":null,"abstract":"<p><strong>Background: </strong>Fetal ultrasound has limitations, especially if the patient is obese or in cases with oligohydramnios. Magnetic resonance imaging (MRI) can then be used as a complement, but only few studies have focused on examinations in the second trimester.</p><p><strong>Purpose: </strong>To validate MRI as a complement to diagnose fetal anomalies in the second trimester.</p><p><strong>Material and methods: </strong>This retrospective study retrieved data from January 2008 to July 2012 from the Fetal Medicine Unit and Department of Radiology at Uppsala University Hospital. Ultrasound and MRI findings were reviewed in 121 fetuses in relation to the final diagnosis, including postpartum follow-up and autopsy results.</p><p><strong>Results: </strong>Of the 121 fetuses, 51 (42%) had a CNS anomaly and 70 (58%) a non-CNS anomaly diagnosed or suspected. MRI provided additional information in 21% of all cases without changing the management and revealed information that changed the management of the pregnancy in 13%. When a CNS anomaly was detected or suspected, the MRI provided additional information in 22% and changed the management in 10%. The corresponding figures for non-CNS cases were 21% and 16%, respectively. The proportion of cases with additional information that changed the management was especially high in patients with a BMI >30 kg/m² (25%) and in patients with oligohydramnios (38%). In five cases in category III, false-positive ultrasound findings were identified.</p><p><strong>Conclusions: </strong>MRI in the second trimester complements ultrasound and improves diagnosis of fetal CNS- and non-CNS anomalies especially when oligohydramnios or maternal obesity is present.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 5","pages":"20584601241248820"},"PeriodicalIF":0.0,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11088812/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140913571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnostic accuracy of transvaginal ultrasonography and hysterosalpingography in the detection of uterine cavity pathologies among infertile women.","authors":"Ifeanyi O Okonkwo, George U Eleje, Nworah J Obiechina, Joseph O Ugboaja, Chisolum O Okafor, Ikechukwu I Mbachu, Hillary I Obiagwu, Ayodele O Okwuosa, Daniel N Onwusulu, Chukwunwendu F Okeke, Chukwuemeka J Ofojebe, Chidinma C Okafor, Chukwudi A Ogabido, Chinedu L Olisa, Chigozie G Okafor","doi":"10.1177/20584601241252335","DOIUrl":"10.1177/20584601241252335","url":null,"abstract":"<p><strong>Background: </strong>Uterine cavity pathology may affect the endometrium or myometrium, resulting in distortion of the uterine cavity, and is responsible for 2%-5% of infertility. The methods for its assessment usually involve imaging modalities like pelvic ultrasonography, often transvaginal-(TVS), and hysterosalpingography-(HSG), with hysteroscopy-(HSC) as the gold standard. However, HSC is not readily available in resource-poor-settings.</p><p><strong>Purpose: </strong>To determine and compare the diagnostic accuracy of TVS and HSG in detecting uterine cavity pathology using HSC as a gold standard.</p><p><strong>Materials and methods: </strong>A cross-sectional analytical study of consenting infertile women for evaluation of the uterine cavity using transvaginal-ultrasonography, hysterosalpingogram, and hysteroscopy. The primary-outcome-measures were the sensitivity, specificity, and accuracy of TVS and HSG in detecting uterine cavity abnormalities using HSG as the gold standard.</p><p><strong>Results: </strong>Eighty-eight participants were analysed for this study. The lesions confirmed on HSC were intrauterine-adhesions (43.1%), endometrial polyps (14.8%), submucous fibroids (18.2%), intrauterine-septum (13.6%), and cavity distortion (14.8%). The overall sensitivity with TVS was 57.7%, with a specificity of 97.6%, a positive-predictive-value (PPV) of 88.2%, and a negative-predictive-value (NPV) of 88.2%, giving a percentage-accuracy of 88.2%. In comparison, HSG had a sensitivity of 72.1%, a specificity of 99.4%, a PPV of 97.4%, and an NPV of 92.0%, giving an overall accuracy of 92.9%. The detection rates of TVS and HSG in this category were: fibroids (97.7% vs 89.8%; <i>p</i> = .0004) and adhesions (73.9% vs 87.5%; <i>p</i> = .0002), respectively.</p><p><strong>Conclusion: </strong>HSG appears to be the superior modality for detection of obliterative uterine cavity pathologies, while TVS is better suited for myometrium and endometrial lesions.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 5","pages":"20584601241252335"},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11084983/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140913570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correlation between diffusion-weighted image-derived parameters and dynamic contrast-enhanced magnetic resonance imaging-derived parameters in the orofacial region.","authors":"Toru Chikui, Masahiro Ohga, Yukiko Kami, Osamu Togao, Shintaro Kawano, Tamotsu Kiyoshima, Kazunori Yoshiura","doi":"10.1177/20584601241244777","DOIUrl":"10.1177/20584601241244777","url":null,"abstract":"<p><strong>Background: </strong>Diffusion-weighted imaging (DWI) and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) are widely used in the orofacial region. Furthermore, quantitative analyses have proven useful. However, a few reports have described the correlation between DWI-derived parameters and DCE-MRI-derived parameters, and the results have been controversial.</p><p><strong>Purpose: </strong>To evaluate the correlation among parameters obtained by DWI and DCE-MRI and to compare them between benign and malignant lesions.</p><p><strong>Material and methods: </strong>Fifty orofacial lesions were analysed. The apparent diffusion coefficient (ADC), true diffusion coefficient (D), pseudodiffusion coefficient (D*) and perfusion fraction (f) were estimated by DWI. For DCE-MRI, TK model analysis was performed to estimate physiological parameters, for example, the influx forward volume transfer constant into the extracellular-extravascular space (EES) (K^trans) and fractional volumes of EES and plasma components (ve and vp).</p><p><strong>Results: </strong>Both ADC and D showed a moderate positive correlation with ve (ρ = 0.640 and 0.645, respectively). K^trans showed a marginally weak correlation with f (ρ = 0.296), while vp was not correlated with f or D*; therefore, IVIM perfusion-related parameters and TK model perfusion-related parameters were not straightforward. Both D and ve yielded high diagnostic power between benign lesions and malignant tumours with areas under the curve (AUCs) of 0.830 and 0.782, respectively.</p><p><strong>Conclusion: </strong>Both D and ve were reliable parameters that were useful for the differential diagnosis. In addition, the true diffusion coefficient (D) was affected by the fractional volume of EES.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 3","pages":"20584601241244777"},"PeriodicalIF":0.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10979534/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140337789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intense prostate-specific membrane antigen receptor expression in coronary artery pypass graft scar tissue: A potential molecular imaging pitfall.","authors":"Akram Al-Ibraheem, Ahmed Saad Abdlkadir, Nabeela Al-Hajaj, Aysar Khalaf, Samer Salah","doi":"10.1177/20584601241240318","DOIUrl":"10.1177/20584601241240318","url":null,"abstract":"<p><p>⁶⁸Gallium-PSMA positron emission tomography/computer tomography has been utilized recently for the diagnosis and staging of prostate cancer. PSMA is a transmembrane protein that is expressed not only in the prostate gland but also in other tissues. While some pitfalls have been addressed, there are still uncertainties. Herein, we report a 79-year-old male with prostate cancer who underwent a PSMA scan after coronary artery bypass graft surgery, revealing disease progression and PSMA-avid foci at the surgical stitch sites. This report discusses the immunohistochemical and molecular imaging mechanisms underlying PSMA expression in surgical scar tissues, providing critical insights for optimizing radiologic reporting in such situations.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 2","pages":"20584601241240318"},"PeriodicalIF":0.9,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10976503/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140338563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A multi-institutional assessment of low-dose protocols in chest computed tomography: Dose and image quality.","authors":"Elena Tonkopi, Mercy Afadzi Tetteh, Catherine Gunn, Haseem Ashraf, Sigrid Lia Rusten, Perkhah Safi, Nora Suu Tinsoe, Kylie Colford, Olivia Ouellet, Salma Naimi, Safora Johansen","doi":"10.1177/20584601241228220","DOIUrl":"10.1177/20584601241228220","url":null,"abstract":"<p><strong>Background: </strong>Low-dose CT (LDCT) chest protocols have widespread clinical applications for many indications; as a result, there is a need for protocol assessment prior to standardization. Dalhousie University and Oslo Metropolitan University have a formally established cooperative relationship.</p><p><strong>Purpose: </strong>The purpose is to assess radiation dose and image quality for LDCT chest protocols in seven different hospital locations in Norway and Canada.</p><p><strong>Material and methods: </strong>Retrospective dosimetry data, volumetric CT dose index (CTDI_vol), and dose length product (DLP) from 240 average-sized patients as well as CT protocol parameters were included in the survey. Effective dose (ED) and size-specific dose estimate (SSDE) were calculated for each examination. For a quantitative image quality analysis, noise, CT number, and signal-to-noise ratio (SNR) were determined for three regions in the chest. The contrast-to-noise ratio (CNR) was calculated for lung parenchyma in comparison to the subcutaneous fat. Differences in dose and image quality were evaluated by a single-factor ANOVA test. A two-sample <i>t</i>-test was performed to determine differences in means between individual scanners.</p><p><strong>Results: </strong>The ANOVA test revealed significant differences (<i>p</i> < .05) in dose values for all scanners, including identical scanner models. Statistically significant differences (<i>p</i> < .05) were determined in mean values of the SNR distributions between the scanners in all three measured regions in the chest, as well as the CNR values.</p><p><strong>Conclusion: </strong>The observed variations in dose and image quality measurements, even within the same hospitals and between identical scanner models, indicate a potential for protocol optimization in the involved hospitals in both countries.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"13 1","pages":"20584601241228220"},"PeriodicalIF":0.9,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10829498/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139673759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of virtual monochromatic imaging with dual-energy computed tomography of small liver metastases from malignant abdominal tumours: Quantitative and qualitative analyses","authors":"Hiroaki Okada, Nozomu Matsunaga, Takahiro Yamamoto, Masato Yamauchi, Kojiro Suzuki","doi":"10.1177/20584601231220324","DOIUrl":"https://doi.org/10.1177/20584601231220324","url":null,"abstract":"Background The assessment of small metastatic liver tumours using dual-energy computed tomography (DECT) has not been fully established. Purpose To assess the effect of low-keV virtual monochromatic imaging (VMI) with non-contrast and contrast-enhanced DECT on the qualitative and quantitative image parameters of small liver metastases. Material and methods Two radiologists retrospectively evaluated 92 metastatic liver tumours (5–20 mm) in 32 patients. Non-contrast and contrast-enhanced VMI were reconstructed at seven energy levels (40–100 keV) with 10-keV intervals. Lesion boundary, lesion delineation, image noise, and overall image quality were evaluated using the visual analogue scale. A high subjective score indicates good overall image quality, clear nodal boundaries and delineation, and less noticeable image noise. Subjective scores were compared using the Kruskal–Wallis test. A quantitative analysis involving the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) was performed. Results The lesion boundary was highest at 40 keV and significantly improved during the non-contrast portal venous phase compared to that at higher keV (p < .005). The lesion delineation score was significantly higher at 40 keV and tended to decrease at higher keV. Image noise and overall image quality were rated low at low keV; however, those at 80, 90, and 100 keV were rated the highest (p < .005). The CNR and SNR were highest for non-contrast CT at 100 keV. During the portal venous phase, no significant differences were observed in CNR and SNR at each keV. Conclusion Low-keV imaging using non-contrast and contrast-enhanced DECT is useful for delineating small hepatic metastatic tumours.","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"27 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138624662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Utility of hyperdense whirl sign for the diagnosis of gallbladder torsion.","authors":"Osamu Sato, Tomoya Kotani, Taisei Kanayama, Bunta Tokuda, Kei Yamada","doi":"10.1177/20584601231218994","DOIUrl":"10.1177/20584601231218994","url":null,"abstract":"<p><p>The purpose of this report was to evaluate the usefulness of hyperdense whirl sign on unenhanced computed tomography (CT) for diagnosing gallbladder torsion. The CT scans of seven patients with gallbladder torsion were independently reviewed by two board-certified radiologists for locating the high-density core with twisting between the gallbladder neck and liver bed, termed hyperdense whirl sign. The sign was observed in six cases. The detection of a hyperdense whirl sign on unenhanced CT appears useful for diagnosing gallbladder torsion.</p>","PeriodicalId":72063,"journal":{"name":"Acta radiologica open","volume":"12 11","pages":"20584601231218994"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10687929/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138479530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}