Axillary Lymph Node Metastases in Patients with Breast Carcinomas: Assessment with Nonenhanced versus USPIO-enhanced MR Imaging
| Autor: | Andreas Kaneider, Mazda Memarsadeghi, Arik Galid, Christopher C. Riedl, Wolfgang Matzek, Margaretha Rudas, Thomas H. Helbich |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Adult
medicine.medical_specialty Axillary lymph nodes Iron Contrast Media Breast Neoplasms Sensitivity and Specificity Breast cancer Predictive Value of Tests medicine Humans Radiology Nuclear Medicine and imaging In patient Prospective Studies Magnetite Nanoparticles Lymph node Aged medicine.diagnostic_test business.industry Ethics committee Dextrans Oxides Magnetic resonance imaging Middle Aged medicine.disease Magnetic Resonance Imaging Mr imaging Ferrosoferric Oxide medicine.anatomical_structure Lymphatic Metastasis Axilla Female Lymph Nodes Radiology Breast carcinoma business |
| Zdroj: | Radiology. 241:367-377 |
| ISSN: | 1527-1315 0033-8419 |
| DOI: | 10.1148/radiol.2412050693 |
| Popis: | To prospectively assess the accuracy of nonenhanced versus ultrasmall superparamagnetic iron oxide (USPIO)-enhanced magnetic resonance (MR) imaging for depiction of axillary lymph node metastases in patients with breast carcinoma, with histopathologic findings as reference standard.The study was approved by the university ethics committee; written informed consent was obtained. Twenty-two women (mean age, 60 years; range, 40-79 years) with breast carcinomas underwent nonenhanced and USPIO-enhanced (2.6 mg of iron per kilogram of body weight intravenously administered) transverse T1-weighted and transverse and sagittal T2-weighted and T2*-weighted MR imaging in adducted and elevated arm positions. Two experienced radiologists, blinded to the histopathologic findings, analyzed images of axillary lymph nodes with regard to size, morphologic features, and USPIO uptake. A third independent radiologist served as a tiebreaker if consensus between two readers could not be reached. Visual and quantitative analyses of MR images were performed. Sensitivity, specificity, and accuracy values were calculated. To assess the effect of USPIO after administration, signal-to-noise ratio (SNR) changes were statistically analyzed with repeated-measurements analysis of variance (mixed model) for MR sequences.At nonenhanced MR imaging, of 133 lymph nodes, six were rated as true-positive, 99 as true-negative, 23 as false-positive, and five as false-negative. At USPIO-enhanced MR imaging, 11 lymph nodes were rated as true-positive, 120 as true-negative, two as false-positive, and none as false-negative. In two metastatic lymph nodes in two patients with more than one metastatic lymph node, a consensus was not reached. USPIO-enhanced MR imaging revealed a node-by-node sensitivity, specificity, and accuracy of 100%, 98%, and 98%, respectively. At USPIO-enhanced MR imaging, no metastatic lymph nodes were missed on a patient-by-patient basis. Significant interactions indicating differences in the decrease of SNR values for metastatic and nonmetastatic lymph nodes were found for all sequences (P.001 to P = .022).USPIO-enhanced MR imaging appears valuable for assessment of axillary lymph node metastases in patients with breast carcinomas and is superior to nonenhanced MR imaging. |
| Databáze: | OpenAIRE |
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