基于病灶-脾脏密度比的CT归一化策略用于肾脏肿块定性
本研究回顾性纳入248例经病理证实的肾脏肿瘤患者，提出病灶-脾脏CT值比值归一化方法，发现增强期病灶-脾脏HU比值是恶性独立预测因子（OR=36.9，p=0.004），对良恶性鉴别AUC达0.883，并有助于区分乳头状与透明细胞RCC。
要点
- 增强期病灶-脾脏HU比值（CE-LS）是恶性独立预测因子，不受病灶大小和绝对强化程度影响。
- CE-LS≤0.89诊断恶性敏感度87.4%、特异度87.5%，AUC=0.883，可作为绝对HU值的补充。
- 乳头状RCC的CE-LS比值显著低于透明细胞RCC，有助于亚型鉴别。
核心结论
- 病灶-脾脏HU归一化是一种简单、可重复、广泛适用的CT方法，可提高肾脏肿块定性能力，有望减少不必要的手术干预。
研究设计与样本
- 回顾性单中心研究，纳入248例经组织病理学证实的肾脏肿瘤患者，均行多期CT检查。
- 在平扫及增强图像上测量病灶、对侧肾皮质和脾脏的CT值，计算病灶-肾脏（LK）和病灶-脾脏（LS）HU比值。
- 采用ROC分析评估诊断效能，单因素和多因素logistic回归分析恶性预测因子，并按RCC亚型进行亚组分析。
诊断标准与关键数值
- 增强期病灶-肾脏（CE-LK）HU比值诊断恶性AUC=0.914，截断值≤0.76时敏感度83.8%、特异度100%。
- 增强期病灶-脾脏（CE-LS）HU比值诊断恶性AUC=0.883，截断值≤0.89时敏感度87.4%、特异度87.5%。
- 多因素分析中仅CE-LS HU比值是恶性独立预测因子（OR=36.9，p=0.004）。
- 乳头状RCC的CE-LS HU比值显著低于透明细胞RCC（p=0.020）；嫌色细胞RCC与其他亚型间无显著差异。
临床应用与阅片要点
- 日常阅片可计算增强期病灶-脾脏HU比值，以≤0.89提示恶性可能，辅助绝对HU值判断。
- 对拟诊乳头状RCC者，注意其CE-LS比值偏低，可与透明细胞RCC鉴别。
- CE-LS比值可能较CE-LK更稳健，因其在多因素分析中独立于病灶大小和绝对强化。
局限性
- 回顾性单中心设计，结论需多中心外部验证。
- 研究未报告读者间一致性及设备/扫描参数差异的影响。
以上解读依据论文摘要（全文未开放获取或许可不允许翻译转载）。
英文原文（摘要）· 点击展开
PURPOSE: Accurate preoperative characterization of renal masses remains a major clinical challenge, as a substantial proportion of surgically resected lesions ultimately prove to be benign. Absolute Hounsfield unit (HU) measurements on contrast-enhanced computed tomography (CT) are widely used but are vulnerable to technical and patient-related variability. This study aimed to introduce and evaluate a novel CT-based normalization strategy using lesion-to-organ HU ratios to improve differentiation between benign and malignant renal masses and to explore its performance across renal cell carcinoma (RCC) subtypes.
METHODS: This retrospective single-center study included 248 patients with histopathologically confirmed renal tumors who underwent multiphasic CT. Attenuation values were measured from the lesion, contralateral renal cortex, and spleen on both non-contrast and contrast-enhanced images. Lesion-to-kidney (LK) and lesion-to-spleen (LS) HU ratios were calculated. Diagnostic performance was evaluated using receiver operating characteristic (ROC) analysis, and predictors of malignancy were assessed with univariate and multivariate logistic regression. Subgroup analysis was performed across RCC subtypes.
RESULTS: Both contrast-enhanced lesion-to-kidney (CE-LK) and lesion-to-spleen (CE-LS) HU ratios differed significantly between benign and malignant lesions (p < 0.01). The CE-LK HU ratio demonstrated excellent diagnostic performance (AUC = 0.914), achieving 83.8% sensitivity and 100% specificity at a cut-off of ≤ 0.76. The CE-LS HU ratio showed similarly high accuracy (AUC = 0.883), with 87.4% sensitivity and 87.5% specificity at a cut-off of ≤ 0.89. In multivariate analysis adjusting for lesion size and absolute enhancement, only the CE-LS HU ratio remained an independent predictor of malignancy (OR = 36.9, p = 0.004). Subtype analysis revealed that papillary RCC exhibited significantly lower CE-LS HU ratios compared with clear cell RCC (p = 0.020), while no significant differences were observed between chromophobe RCC and other subtypes.
CONCLUSION: Lesion-to-spleen HU normalization is a simple, reproducible, and broadly applicable CT-based approach that enhances renal mass characterization and may aid in reducing unnecessary surgical interventions.
引用
- Akpinar O, Erkan A, Keskin A, et al. A novel CT-based normalization strategy using lesion-to-spleen density ratios for renal mass characterization. Abdom Radiol (NY). 2026. PMID: 42029686. doi:10.1007/s00261-026-05534-w
供执业医师工作参考，不替代临床判断；数值与分级以指南原文为准。