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  • Title: The diagnostic ability of 18F-FDG PET/CT for mediastinal lymph node staging using 18F-FDG uptake and volumetric CT histogram analysis in non-small cell lung cancer.
    Author: Lee JW, Kim EY, Kim DJ, Lee JH, Kang WJ, Lee JD, Yun M.
    Journal: Eur Radiol; 2016 Dec; 26(12):4515-4523. PubMed ID: 26943133.
    Abstract:
    OBJECTIVES: To evaluate the clinical implications of lymph node (LN) density on 18F-FDG PET/CT for mediastinal LN characterization in non-small cell lung cancer (NSCLC). METHODS: One hundred and fifty-two patients with 271 mediastinal LNs who underwent PET/CT and endobronchial ultrasound-guided transbronchial needle aspiration for staging were enrolled. Maximum standardized uptake value (SUVmax), short axis diameter, LN-to-primary cancer ratio of SUVmax, and median Hounsfield unit (HU) based on CT histogram were correlated to histopathology. RESULTS: Of 271 nodes, 162 (59.8 %) were malignant. SUVmax, short axis diameter, and LPR of malignant LNs were higher than those of benign nodes. Among malignant LNs, 71.0 % had median HU between 25 and 45, while 78.9 % of benign LNs had values <25 HU or >45 HU. Using a cutoff value of 4.0, SUVmax showed the highest diagnostic ability for detecting malignant LNs with a specificity of 94.5 %, but showing a sensitivity of 70.4 %. Using additional density criteria (median HU 25-45) in LNs with 2.0< SUVmax ≤4.0, the sensitivity increased to 88.3 % with the specificity of 82.6 %. CONCLUSIONS: LN density is useful for the characterization of LNs with mild 18F-FDG uptake. The risk of mediastinal LN metastasis in NSCLC patients could be further stratified using both 18F-FDG uptake and LN density. KEY POINTS: • SUVmax showed the highest diagnostic ability for detecting malignant LNs. • LN density was useful in characterization of LNs with mild FDG uptake. • SUVmax and LN density together could stratify the risk of LN metastasis.
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