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Adel M Malek - One of the best experts on this subject based on the ideXlab platform.

  • Crescent Sign on magnetic resonance angiography revealing incomplete stent apposition correlation with diffusion weighted changes in stent mediated coil embolization of aneurysms
    Journal of Neurosurgery, 2011
    Co-Authors: Robert S Heller, William R Miele, Daniel D Dodai, Adel M Malek
    Abstract:

    Object Few data are available on how closely stents appose the luminal vessel wall in stent-mediated coil embolization of intracranial aneurysms and on the effect of incomplete stent apposition on procedural thromboembolic complications. Methods Postprocedural 3-T MR diffusion-weighted imaging and time-of-flight angiography were obtained in 58 patients undergoing stent-mediated coil embolization of aneurysms using the Enterprise closed-cell and Neuroform open-cell self-expanding intracranial microstents. Results A distinctive semilunar Signal pattern, identified using 3-T MR angiography, represented flow outside the confines of the stent struts in patients in whom Enterprise but not Neuroform devices were used. This pattern, deSignated as the Crescent Sign, was confirmed to correspond to incomplete stent apposition by use of high-resolution angiographic flat-panel CT scanning revealing flow ingress into and egress out of the isolated luminal wedge. The presence of the Crescent Sign was seen in 18 of 33 En...

D Jurkovic - One of the best experts on this subject based on the ideXlab platform.

  • a comparative study of the risk of malignancy index and the ovarian Crescent Sign for the diagnosis of invasive ovarian cancer
    Ultrasound in Obstetrics & Gynecology, 2006
    Co-Authors: J Yazbek, K Hillaby, N Aslam, K S Raju, A Tailor, D Jurkovic
    Abstract:

    Objective To compare the value of the risk of malignancy index (RMI) and the ovarian Crescent Sign (OCS) in the diagnosis of ovarian malignancy. Methods This was a prospective observational study of women with ultrasonographic diagnosis of an ovarian cyst. The RMI was calculated in all cases using a previously published formula (RMI = U (ultrasound score) × M (menopausal status) × serum CA125 (kU/L)). A value > 200 was considered to be diagnostic of ovarian cancer. The OCS was defined as a rim of visible healthy ovarian tissue in the ipsilateral ovary. Its absence was taken as being diagnostic of invasive cancer. Results A total of 106 consecutive women were included in the study, of whom 92 (86.8%) had a benign ovarian tumor, five (4.7%) had borderline lesions and nine (8.5%) had an invasive ovarian cancer. The absence of an OCS diagnosed invasive ovarian cancer with a sensitivity of 100% (95% CI, 70–100%), specificity of 93% (95% CI, 86–96%), positive predictive value (PPV) of 56%, negative predictive value (NPV) of 100% and positive likelihood ratio (LR+) of 13.86 (95% CI, 6.79–28.29). This compared favorably with a sensitivity of 89% (95% CI, 57–98%), specificity of 92% (95% CI, 85–96%), PPV of 50%, NPV of 99% and LR+ of 10.78 (95% CI, 5.34–21.77), which were achieved using RMI > 200 (P < 0.01). Conclusions The RMI and the OCS are useful tests for discriminating between invasive and non-invasive ovarian tumors. The application of these tests in a sequential manner might improve the overall accuracy of ovarian cancer diagnosis. Copyright © 2006 ISUOG. Published by John Wiley & Sons, Ltd.

  • the value of detection of normal ovarian tissue the ovarian Crescent Sign in the differential diagnosis of adnexal masses
    Ultrasound in Obstetrics & Gynecology, 2004
    Co-Authors: K Hillaby, N Aslam, R Salim, A Lawrence, K S Raju, D Jurkovic
    Abstract:

    Objective The aim of the study was to evaluate whether the presence of normal ovarian tissue adjacent to an adnexal tumor (the ‘ovarian Crescent Sign’) could assist in the preoperative differential diagnosis of adnexal lesions. Methods This was a prospective observational study including 100 women with a preoperative diagnosis of an adnexal mass. Demographic and biochemical data were collected and all women underwent a detailed transvaginal ultrasound scan. Tumor volume, morphological characteristics and Doppler features were recorded in each case. In addition, the tissue adjacent to the cyst was systematically examined for the presence of normal ovarian tissue. All the findings were compared to the final histological diagnosis. Results Sixty-seven (67%) of the cysts removed were benign, nine (9%) were borderline and 24 (24%) women had invasive malignant lesions. Normal ovarian tissue was seen in 58/76 (76%) women with non-invasive lesions, and in one woman (4%) with an invasive malignancy. In the absence of normal ovarian tissue, ovarian cancer was diagnosed with a sensitivity of 96% and specificity of 76%. Conclusion The presence of normal ovarian tissue adjacent to an ovarian cyst is a useful morphological feature that may be used to help exclude an invasive ovarian malignancy in women with adnexal masses detected on ultrasound scan. Copyright © 2003 ISUOG. Published by John Wiley & Sons, Ltd.

James L. Brunton - One of the best experts on this subject based on the ideXlab platform.

Erol Cengiz - One of the best experts on this subject based on the ideXlab platform.

  • Primer inguinal herni ayrımında bilgisayarlı tomografinin yararlılığı
    'Baishideng Publishing Group Inc.', 2015
    Co-Authors: Hasbahçeci Mustafa, Erol Cengiz
    Abstract:

    Objective: The perception of inguinal anatomy during hernia formation may be an important issue for the evaluation of hernias. This study was conducted to describe detailed anatomy of inguinal region in patients with primary inguinal hernia by using computed tomography. Methods: Study group included 18 inguinal hernia patients with computed tomography images. Images with multi-planar reformatting were evaluated with regard to anatomical landmarks found in inguinal region. Results: Visualization of inguinal ligament and inferior epigastric artery was possible in all patients. Type of inguinal hernia was defined correctly in all patients by using inferior epigastric artery as an anatomic landmark. Pubic tubercle and lateral Crescent Sign in differentiation between direct and indirect inguinal hernias had variable sensitivity and specificity (0.69 and 0.60 for pubic tubercle, and 0.69 and 0.80 for lateral Crescent Sign, respectively). Conclusion: Multi-planar reformatting helps physicians to differentiate types of inguinal hernia by using the inferior epigastric artery as an anatomic landmark.Amaç: Herni oluşumu sürecinde inguinal bölge anatominin algılanması, hernilerin değerlendirilmesi için önemli bir sorun olabilir. Bu çalışma, bilgisayarlı tomografi tardımı ile primer inguinal herni hastalarındaki inguinal bölge anatomisinin detaylı bir şekilde tanımlanması için düzenlenmiştir. Yöntemler: Çalışma grubu bilgisayarlı tomografi görüntüleri olan 18 inguinal herni hastasından oluşmakta idi. Çok kesitli yeniden biçimlendirme ile elde edilen görüntüler, inguinal bölgede bulunan anatomik belirleyiciler gözönüne alınarak değerlendirildi. Bulgular: İnguinal ligament ve inferior epigastrik arterin görüntülenmesi hastaların tamamında gerçekleşti. Hastaların tamamında, inferior epigastrik arterin anatomik belirleyici olarak kullanılması ile herni türü doğru bir şekilde belirlendi. Direkt ve indirekt herni ayrımında pubik tüberkül ve lateral hilal bulgularının özgüllük ve duyarlılığı değişkenlik göstermekte idi (pubik tüberkül bulgusu için 0.69 ve 0.60; lateral hilal bulgusu için 0.69 ve 0.80). Sonuç: Çok kesitli yeniden biçimlendirme, anatomik belirleyici olarak inferior epigastrik arterin kullanılması ile inguinal herni tiplerinin belirlenmesinde hekimlere yardımcı olmaktadır

  • Primer inguinal herni ayrımında bilgisayarlı tomografinin yararlılığı
    'Gazi University', 2015
    Co-Authors: Hasbahçeci Mustafa, Erol Cengiz
    Abstract:

    WOS: 000217478800010Objective: The perception of inguinal anatomy during hernia formation may be an important issue for the evaluation of henias. This study was conducted to describe detailed anatomy of inguinal region in patients with primary inguinal hernia by using computed tomography. Methods: Study group included 18 inguinal hernia patients with computed tomography images. Images with multi-planar reformatting were evaluated with regard to anatomical landmarks found in inguinal region. Results: Visualization of inguinal ligament and inferor egigastric artery was possible in all patients. type of inguinal hernia was defined correctly in all patients by using inferior egipastric artery as an anatomic landmark. Public tuberlce and lateral Crescent Sign in differentiation between direct and indirect inguinal hernias had variable sensivtivity and specificity (0.69 and 0.60 for public tuberlce and 0.69 and 0.80 for lateral Crescent Sign, respectively). Conclusion: Multi-planar reformatting helps physicians to differentiate types of inguinal hernia by uising the inferior eepigastric artery as an anatomic landmark.Amaç: Herni oluşumu sürecinde inguinal bölge anatominin algılanması, hernilerin değerlendirilmesi için önemli bir sorun olabilir. Bu çalışma, bilgisayarlı tomografi tardımı ile primer inguinal herni hastalarındaki inguinal bölge anatomisinin detaylı bir şekilde tanımlanması için düzenlenmiştir. Yöntemler: Çalışma grubu bilgisayarlı tomografi görüntüleri olan 18 inguinal herni hastasından oluşmakta idi. Çok kesitli yeniden biçimlendirme ile elde edilen görüntüler, inguinal bölgede bulunan anatomik belirleyiciler gözönüne alınarak değerlendirildi. Bulgular: İnguinal ligament ve inferior epigastrik arterin görüntülenmesi hastaların tamamında gerçekleşti. Hastaların tamamında, inferior epigastrik arterin anatomik belirleyici olarak kullanılması ile herni türü doğru bir şekilde belirlendi. Direkt ve indirekt herni ayrımında pubik tüberkül ve lateral hilal bulgularının özgüllük ve duyarlılığı değişkenlik göstermekte idi (pubik tüberkül bulgusu için 0.69 ve 0.60; lateral hilal bulgusu için 0.69 ve 0.80). Sonuç: Çok kesitli yeniden biçimlendirme, anatomik belirleyici olarak inferior epigastrik arterin kullanılması ile inguinal herni tiplerinin belirlenmesinde hekimlere yardımcı olmaktadır

Carin F Gonsalves - One of the best experts on this subject based on the ideXlab platform.

  • the hyperattenuating Crescent Sign
    Radiology, 1999
    Co-Authors: Carin F Gonsalves
    Abstract:

    The Crescent-shaped area of hyperattenuation within the aortic wall or mural thrombus of an abdominal aortic aneurysm (AAA) is known as the hyperattenuating Crescent Sign and suggests acute or impending AAA rupture (1). The curvilinear area paralleling the aortic wall is best demonstrated on nonenhanced computed tomographic (CT) images and is of higher attenuation than the intraluminal aortic blood (Figure) (2). At contrast material–enhanced CT, the hyperattenuating Crescent is of higher attenuation compared with the adjacent psoas muscle (1).