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肾上腺血运丰富,是恶性肿瘤的常见转移部位之一,CT、MRI、B超等检查对肾上腺病灶的定位诊断具有很高的灵敏度,但均不能准确定性及判断肿瘤全身转移情况。PET-CT是融合了功能定性与解剖定位的影像技术,能对患者进行全身代谢显像,对恶性肿瘤的肾上腺转移灶具有较高的诊断价值,并能同时发现原发病灶及其他转移灶。本研究通过对在我院行18F-FDG PET-CT的77例肾上腺病变患者的PET-CT影像特征及临床资料进行综合分析,探讨18F-FDG PET-CT在肾上腺转移癌中的诊断价值及其最佳诊断标准。
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59例肾上腺转移癌患者共78个肾上腺病灶中,有65个病灶的放射性摄取显著增高(SUVmax>3.1),明显高于正常肝组织(图 1),有13个病灶的大小(短径)<1.0 cm,且SUVmax<3.1,但只有3个病灶的SUVmax低于正常肝组织。59例肾上腺转移癌患者中,57例患者同时伴有其他转移灶(图 1);47例原发肿瘤病灶表现为高代谢,10例原发病灶已切除,2例原发病灶不明但有全身多器官转移。
良性病变18例共21个肾上腺病灶中,有19个病灶未见放射性摄取增高(SUVmax<3.1)或低于正常肝组织(图 2),有2个病灶SUVmax>3.1且高于正常肝组织,但术后病理结果显示这2个病灶均为肾上腺皮脂腺瘤;9例患者有恶性肿瘤病史或存在其他部位的恶性肿瘤病灶,但其肾上腺占位均为良性(图 2)。
2组患者肾上腺病灶的大小(短径)、SUVmax及病灶SUVmax与正常肝脏的SUVmax比值结果见表 1。肾上腺转移癌的病灶SUVmax、病灶SUVmax与正常肝脏SUVmax的比值均高于肾上腺良性病变,差异均有统计学意义;而转移癌与良性病变的病灶大小(短径)之间的差异并无统计学意义。
组别 病灶数 病灶大小
[短径(cm)]病灶SUVmax 病灶SUVmax与正常肝脏SUVmax比值 肾上腺转移癌组 78 1.52±1.05 7.05±5.26 2.89±2.49 肾上腺良性病变组 21 1.66±0.91 2.27±1.35 0.79±0.47 t值 0.529 7.199 6.983 P值 >0.05 <0.01 <0.01 表 1 肾上腺转移癌及良性病变的病灶大小(短径)、SUVmax及病灶SUVmax与正常肝脏SUVmax比值对比
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2组患者的肾上腺病灶分布见表 2。肾上腺转移癌半数以上发生在左侧肾上腺,其次为双侧肾上腺;而肾上腺良性病变好发于单侧,且左右两侧发病率相似,双侧发病较少见。
组别 病例数 左侧病灶 右侧病灶 双侧病灶 肾上腺转移癌组 59 30(50.8) 10(17.0) 19(32.2) 肾上腺良性病变组 18 8(44.4) 7(38.9) 3(16.7) 表 2 肾上腺转移癌及良性病变的病灶分布比例
[例数(%)] -
采用ROC曲线分析所有肾上腺病灶的SUVmax及其与正常肝脏SUVmax的比值,根据各点所对应的灵敏度和误诊率得出区分良恶性病变的最佳临界值;以肾上腺病灶SUVmax>3.1作为良恶性诊断临界值,其诊断灵敏度、特异度和准确率分别为83.3%、90.5%和84.9%;以肾上腺病灶SUVmax与正常肝组织SUVmax的比值>1作为良恶性诊断标准,则诊断灵敏度、特异度、准确率分别为96.2%、90.5%和95.0%。肾上腺转移癌病灶的大小(短径)与其SUVmax的相关性分析,相关系数为0.501。
18F-FDG PET-CT在肾上腺转移癌诊断中的价值及其诊断标准探讨
Diagnostic value and diagnostic criteria of 18F-FDG PET-CT in adrenal metastasis
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摘要:
目的 研究18F-FDG PET-CT对肾上腺转移性癌的诊断价值,并探讨其最佳诊断标准。 方法 对59例术后病理或临床随访确诊为肾上腺转移癌及18例肾上腺良性病变患者行18F-FDG PET-CT检查,分别测量肾上腺病灶的大小、SUVmax及正常肝组织的SUVmax,进行综合分析。 结果 59例肾上腺转移癌患者共78个肾上腺病灶,SUVmax为7.05±5.26,18例良性病变患者共21个肾上腺病灶,SUVmax为2.27±1.35,两者之间的差异有统计学意义(t=7.199,P<0.01);肾上腺转移癌与良性病灶的大小(短径)分别为(1.52±1.05)cm和(1.66±0.91)cm,两者之间的差异无统计学意义(t=0.529,P>0.05)。受试者工作特征曲线分析,以肾上腺病灶SUVmax>3.1作为良恶性的诊断标准,其诊断灵敏度、特异度和准确率分别为83.3%、90.5%和84.9%;以肾上腺病灶SUVmax与正常肝组织的SUVmax比值>1作为良恶性诊断标准,则诊断的灵敏度、特异度、准确率分别为96.2%、90.5%和95.0%;肾上腺转移癌病灶大小(短径)与其SUVmax相关系数为0.501。肾上腺转移癌在双侧肾上腺的分布比例为:左侧30例(50.8%),右侧10例(17.0%),双侧19例(32.2%)。 结论 18F-FDG PET-CT对于肾上腺转移瘤的诊断具有较高的灵敏度及准确率;以肾上腺病灶SUVmax与正常肝组织的SUVmax比值>1为标准,可较好地诊断出肾上腺转移瘤的良恶性;肾上腺转移癌病灶的大小与其SUVmax有一定相关性,病灶常累及左侧。 -
关键词:
- 肾上腺肿瘤 /
- 肿瘤转移 /
- 正电子发射断层显像术 /
- 体层摄影术,X线计算机 /
- 氟脱氧葡萄糖F18
Abstract:Objective To investigate the value of 18F-FDG PET-CT in the diagnosis of the adrenal metastasis and study its diagnostic criteria. Methods Fifty-nine patients with adrenal metastasis and 18 patients with adrenal benign tumor underwent 18F-FDG PET-CT, all of the adrenal lesion's diameter and FDG maximum standardized uptake values(SUVmax), SUVmax of normal liver were measured and analyzed comprehensively. All lesions underwent biopsy after operation or follow-up in clinic or imaging diagnosis for final diagnosis. Results There were 78 adrenal lesions of 59 cases with adrenal metastasis, and 21 adrenal lesions of 18 cases with adrenal benign. The SUVmax of adrenals metastasis was 7.05±5.26, while benign tumor was 2.27±1.35, statistical significant difference was found between the 2 groups(t=7.199, P < 0.01). The short diameter of adrenal metastasis was (1.66±0.91) cm, benign tumor was (1.52±1.05) cm, there was no statistical significant difference between the 2 groups(t=0.529, P > 0.05). Receiver operator characteristic curve analysis showed that using lesion's SUVmax > 3.1 as the diagnostic criteria of benign and metastatic adrenal lesions, the sensitivity, specificity and accuracy of 18F-FDG PET- CT in diagnosis of adrenals metastasis were 83.3%, 90.5% and 84.9%, respectively. But if using the SUVmax of adrenal lesion exceeds normal liver tissue as the diagnostic criteria, the sensitivity, specificity and accuracy were 96.2%, 90.5% and 95.0%. For adrenals metastasis, the correlation coefficient between lesion size(short diameter) and SUVmax was 0.501. Among all 59 cases with adrenal metastasis, 30(50.8%) patients' lesions in the left adrenal gland, 10(16.9%)in the right side and 19(32.2%) in the both sides. Conclusion 18F-FDG PET-CT has high sensitivity and accurate in diagnosis of adrenal metastasis, and the SUVmax of adrenal lesion exceeds normal liver tissue is a better diagnostic criteria. The size of adrenal metastasis lesions has certain correlation with its SUVmax and the lesions often in the left side gland and lung cancer is the more common primary tumor. -
表 1 肾上腺转移癌及良性病变的病灶大小(短径)、SUVmax及病灶SUVmax与正常肝脏SUVmax比值对比
组别 病灶数 病灶大小
[短径(cm)]病灶SUVmax 病灶SUVmax与正常肝脏SUVmax比值 肾上腺转移癌组 78 1.52±1.05 7.05±5.26 2.89±2.49 肾上腺良性病变组 21 1.66±0.91 2.27±1.35 0.79±0.47 t值 0.529 7.199 6.983 P值 >0.05 <0.01 <0.01 表 2 肾上腺转移癌及良性病变的病灶分布比例
[例数(%)] 组别 病例数 左侧病灶 右侧病灶 双侧病灶 肾上腺转移癌组 59 30(50.8) 10(17.0) 19(32.2) 肾上腺良性病变组 18 8(44.4) 7(38.9) 3(16.7) -
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