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Prospective ultrasonographic prediction of sentinel lymph node metastasis by real-time virtual sonography constructed with three-dimensional computed tomography–lymphography in breast cancer patients

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Abstract

Background

Real-time virtual sonography (RVS) systems display virtual multiplanar reconstruction (MPR) images obtained from three-dimensional (3D) computed tomography (CT)–lymphography (LG), significantly improving preoperative detection of sentinel lymph nodes (SLNs). The purpose of this study was to prospectively evaluate SLN metastasis using an RVS system.

Methods

We identified SLNs in 73 clinically node-negative breast cancer patients using an RVS system to display in real time a virtual MPR obtained from CT volume data corresponding to the same cross-sectional image from ultrasonography (US). CT volume data were obtained using our original 3DCT–LG, which accurately detects SLNs in breast cancer. We then prospectively attempted to predict metastasis to SLNs. SLN metastases were assessed by measuring the cortex thickness in the presence of a visible hilum. We defined suspected SLN metastases as SLNs with a cortex thickness of at least 2.5 mm on the basis of our preliminary data. All patients underwent SLN biopsy and SLN metastases were examined pathologically with serial 2.0-mm-thick multiple slices.

Results

Suspected SLN metastases were identified in 24 of 73 patients, and 13 of these 24 patients were pathologically positive. The remaining 49 patients displayed no suspected SLNs, and 46 of these 49 were pathologically negative. Sensitivity, specificity, positive predictive value, negative predictive value, and overall accuracy of measuring cortical thickness for predicting metastatic involvement of SLNs were 81, 81, 54, 94, and 81%, respectively.

Conclusion

If cortical thickness of the SLN is less than 2.5 mm, SLN metastasis is unlikely to be present. If cortical thickness of the SLN is at least 2.5 mm, preoperative fine-needle aspiration cytology may be recommended to verify the possibility of SLN metastasis.

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Authors and Affiliations

  1. Department of Digestive Surgery and Surgical Oncology (Department of Surgery II), Yamaguchi University Graduate School of Medicine, 1-1-1 Minamikogushi, Ube, Yamaguchi, 755-8505, Japan

    Shigeru Yamamoto, Noriko Maeda, Michiko Tamesa, Yukiko Nagashima, Kiyoshi Yoshimura & Masaaki Oka

Authors
  1. Shigeru Yamamoto
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  2. Noriko Maeda
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  3. Michiko Tamesa
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  4. Yukiko Nagashima
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  5. Kiyoshi Yoshimura
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  6. Masaaki Oka
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Correspondence to Shigeru Yamamoto.

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Yamamoto, S., Maeda, N., Tamesa, M. et al. Prospective ultrasonographic prediction of sentinel lymph node metastasis by real-time virtual sonography constructed with three-dimensional computed tomography–lymphography in breast cancer patients. Breast Cancer 19, 77–82 (2012). https://doi.org/10.1007/s12282-011-0275-4

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  • DOI: https://doi.org/10.1007/s12282-011-0275-4

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