36, No. The contrast enhancement in the main pulmonary artery was measured in each patient. There was no statistically significant difference between electron-beam and spiral CT in the total number of analyzable peripheral arteries depicted. Electron-beam CT was performed in 28 patients. Sun S, Semionov A, Xie X, Kosiuk J, Mesurolle B. Int J Cardiovasc Imaging. Up-dated version October 4, 2015. Atelectasis results in loss of lung volume while consolidation maintains or even increases lung volume. CT angiography of the pulmonary arteries was performed in 56 patients to rule out pulmonary embolism. Small distal PEs may be incidentally found in an asymptomatic patient; more often, these PEs are found … The Egyptian Journal of Radiology and Nuclear Medicine, Vol. 217, No. One segmental (RA7, P =.010) and two subsegmental (LA7b, P =.029; RA6a+b, P =.038) arteries in paracardiac and basal segments of the lung were depicted significantly better with electron-beam CT. There was no statistically significant difference between electron-beam and spiral CT in the total number of analyzable peripheral arteries depicted. 2Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands ... (PE). In each lung, the common patterns are lobar and 10 segmental arterial structures. A large segmental defect covers >75% of a pulmonary segment. On the other hand a large analysis published in Blood in 2013 came to the opposite conclusions. The mean contrast enhancement in the main pulmonary … Materials and methods: They may be an indicator of silent deep venous thrombosis, which may predispose patients to more severe embolic events. Similarly, another inte-robserver agreement study reported a j of 0.38 (95% CI: 0.0– 0.89) for SSPE among radiologists with varied levels of experience [11]. CONCLUSION: Detailed visualization of peripheral pulmonary arteries is well within the scope of advanced CT techniques. SSPE = 1.7%; Segmental and More Proximal PE = 1.6% The reported incidence of isolated segmental PE … 1 As CTPA allows better visualization of peripheral pulmonary arter - ies compared to previously used imaging techniques, small emboli isolated to subsegmental branches of the pulmonary artery tree are increasingly being detected. Among 15 963 patients with a first episode of acute symptomatic PE, 834 (5.2%) had subsegmental PE, 3797 (24%) had segmental PE, and 11 332 (71%) had central PE. Patient underwent embolectomy, and diagnosis was confirmed. 47, No. High-probability perfusion lung scan shows segmental perfusion defects in the right upper lobe and subsegmental perfusion defects in right lower lobe, left upper lobe, and left lower lobe. 2, 1 February 2004 | Radiology, Vol. Introduction Overuse of CT Pulmonary Angiograms (CTPA) for diagnosing pulmonary embolism (PE), particularly in Emergency Departments (ED), is considered problematic. Comment in Radiology. segmental and subsegmental PE in those studies (8, 10–12, 14, 17). There was no statistically significant difference between electron-beam and spiral CT in the total number of analyzable peripheral arteries depicted. As the use of chest CT-angiograms in emergency departments and medical wards has risen by more than tenfold, so has the discovery of small pulmonary emboli of unclear clinical significance. The term subsegmental atelectasis includes any loss of lung volume so small that it does not cause indirect signs of volume loss (as might be seen with larger atelectases). MATERIALS AND METHODS: CT angiography of the pulmonary arteries was performed in 56 patients to rule out pulmonary embolism. cavitation. The subsegmental arteries are identified as dichotomous divisions of the segmental arteries. MATERIALS AND METHODS: Data are from examinations of 375 patients with angiographically diagnosed PE who participated in the Prospective Investigation of … Whether these filling defects reported on CTPA would correlate with true subsegmental PE (SSPE) on pulmonary angiography or are actually artifacts is unknown. (1-3) Small segmental or subsegmental PE are of importance in patients with limited cardiopulmonary reserve and for diagnosis of chronic pulmonary hypertension. was lower with regard to segmental and subsegmental PE (j = 0.47; 95% CI, 0.16–0.84) [10]. 2007 Aug;17(8):1954-9. doi: 10.1007/s00330-007-0577-2. Their mean age was 64, 65, and 67 years, respectively, and 48% were men. Thoracic incidental diagnoses other than PE were also sought. 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