18F-FDG PET/CT在不明原发灶肿瘤中的临床应用价值

目的探讨18F-FDG PET/CT全身显像在不明原发灶肿瘤（CUP）诊断中的临床应用价值。方法回顾分析46例于2015年2月至2016年6月在我院行常规检查未能发现肿瘤原发灶而进一步行18F-FDG PET/CT全身显像查找肿瘤原发灶的转移性肿瘤患者的资料。PET/CT图像分析采用视觉及半定量分析方法。通过病理活检和（或）临床综合诊断、临床随访对结果进行评价。结果46例患者中,18F-FDG PET/CT显像找到原发肿瘤33例,均经过病理活检及临床随访证实;13例未发现原发病灶。18F-FDG PET/CT对不明肿瘤原发灶的检出率为71.7%（33/46）,其中阳性患者中淋巴瘤3例、胃癌2例、食管癌4例、卵巢癌3例、肺癌14例、肝癌2例、尿路上皮癌1例、鼻咽癌2例、多发性骨髓瘤1例、降结肠癌1例。转移方式主要有淋巴结转移32例、骨转移20例、肝转移13例、肺转移9例、胸膜腹膜转移5例、肾上腺转移3例、脑转移4例、皮下转移3例、心包膜转移1例。结论18F-FDG PET/CT全身显像对CUP的检出率显著优于一般常规检查,对临床指导治疗有着重要意义。     

18F-FDG PET/CT全身显像在原发灶不明转移癌中的临床应用

目的 探讨18F-脱氧葡萄糖(FDG)PET/CT全身显像在原发灶不明转移癌(CUP)诊断中的临床应用价值.方法 回顾性分析2006年1月至2007年6月2589例18F-FDG PET/CT显像患者中169例CUP患者的显像结果,通过分析病历记录、病理检查结果及临床随访确定最终原发灶诊断结果.结果 169例CUP患者中19例失访,150例有完整资料.70例成功探测到原发灶,总检出率为46.7%(70/150),其中52例得到病理检查证实,18例为临床诊断;肺癌38例,占54.3%,鼻咽癌8例,占11.4%,消化系统肿瘤13例,占18.6%,其他肿瘤11例,占15.7%.3例临床怀疑转移瘤,18F-FDG PET/CT未见明显恶性征象,经随访证实为良性病变.6例PET/CT诊断错误.15例患者没有确诊.56例未探测到原发灶,其中3例在随访过程中得到确诊,分别为鼻咽癌、膀胱癌、食管癌各1例.结论 18F-FDG PET/CT全身显像对诊断CUP具有重要临床价值.     

应用全身18F-FDG PET/PET-CT为脑转移瘤患者寻找原发灶

目的 评价全身18F-FDG PET/PET-CT在脑转移瘤寻找原发灶中的诊断价值.方法 对67例以脑转移瘤查找原发灶为主诉的肿瘤患者的18F-FDG PET/PET-CT资料进行回顾性分析.结果 本组67例患者中57例患者的原发灶位置得到了确诊,原发灶的检出率为85.1%;其中原发性肺癌29例,占50.9%;所有肺癌中病理分型为低分化腺癌者共13/29例,占44.8%.除可检出原发灶外,18F-FDG PET/PET-CT全身显像还检出肺转移、淋巴结转移、骨转移、肝转移及其他少见部位的转移灶.与"F-FDG PET-CT相比,单纯的18F-FDG PET图像对肺转移病灶的检出率仅为10.9%.结论 18F-FDG PET/PET-CT的全身扫描有利于发现原发灶及其他转移灶.     

~(18)F-FDG PET/CT在原发灶不明的颈部淋巴结转移瘤中的应用研究

目的探讨~(18)F-FDG PET/CT全身显像在颈部淋巴结转移瘤中寻找原发灶的临床应用价值。方法回顾性分析于青岛大学附属医院行~(18)F-FDG PET/CT检查且病理确诊颈部淋巴结转移瘤的患者87例。分析颈部淋巴结转移瘤的病理类型及原发灶组织器官来源,~(18)F-FDG PET/CT诊断原发灶的灵敏度、特异度、准确度、阳性预测值和阴性预测值。结果颈部淋巴结转移瘤病理类型包括鳞状细胞癌49例(56. 3%)、腺癌23例(26. 4%)、小细胞癌6例(6. 9%)、其他9例(10. 3%)。经病理确诊原发灶71例(81. 6%):其中咽部肿瘤32例(喉咽15例、鼻咽14例、口咽3例)(44. 4%)、肺癌16例(22. 5%)、食管癌6例(8. 5%)、子宫癌3例(4. 2%)、扁桃体癌3例(4. 2%)、其他恶性肿瘤11例(15. 5%)。原发灶病理构成:鳞状细胞癌43例(60. 6%)、腺癌19例(26. 8%)、小细胞癌6例(8. 5%)、其他3例(4. 2%)。~(18)F-FDG PET/CT全身显像正确诊断63例。灵敏度、特异度、阳性预测值、阴性预测值及诊断符合率分别为:88. 7%(63/71)、31. 3%(5/16)、85. 1%(63/74)、38. 5%(5/13)、78. 2%(68/87)。结论颈部淋巴结转移瘤的原发灶主要集中在咽部、肺、食道等,以鳞癌、腺癌为主,~(18)F-FDG PET/CT全身显像寻找原发灶具有较高的灵敏度和阳性预测值;确诊或可疑颈部淋巴结转移瘤时寻找原发灶可首选~(18)F-FDG PET/CT全身显像。     

18F-FDG PET/CT对原发不明颈部淋巴结转移癌患者原发灶检出的价值

目的 探讨18F-FDG PET/CT在原发不明颈部淋巴结转移癌患者原发灶检出中的临床应用价值.方法 回顾性分析2007年至2012年间因颈部淋巴结细针穿刺活组织检查提示转移但原发不明而行18F-FDG PET/CT检查的患者78例,其中男48例,女30例,平均年龄(56.4±14.7)岁.在PET/CT图像上勾画ROI并计算SUVmax.将淋巴结分为Ⅰ～Ⅵ区、咽后区及锁骨上区,取淋巴结短径为其大小.患者均经病理、随访确诊.观察肿瘤原发灶部位、病理类型及转移淋巴结分布、大小及SUVmax.采用单因素方差分析及直线相关分析分析数据.结果 78例患者中,恶性75例,良性3例(手术切除后病理检查).56例患者由PET/CT检出原发灶,检出率为71.8％(56/78).其中头颈部肿瘤占57.1％(32/56),对应转移淋巴结多分布于Ⅱ、Ⅲ、Ⅳ区(90.6％,29/32);体部肿瘤占42.9％(24/56),对应转移淋巴结多分布于锁骨上区(95.8％,23/24).不同原发部位及不同病理类型的颈部转移淋巴结大小和SUVmax差异均无统计学意义(F=0.037～ 2.413,均P＞O.05).结论 18F-FDGPET/CT有利于判断原发不明肿瘤的大致部位,并了解全身病灶分布.     

18F-FLT联合18F-FDG PET/CT显像对胃癌原发灶及区域淋巴结转移的诊断价值

目的 评价18 F-FLT联合18F-FDG PET/CT显像对胃癌原发灶及区域淋巴结转移的诊断价值.方法 回顾性分析2011年3月至2013年4月间37例经活组织检查证实的胃癌患者临床资料.所有患者术前均行18F-FLT和18F-FDG双显像剂PET/CT检查,对显像结果分别进行视觉分析和半定量分析.应用SPSS 13.0软件分别对不同病理类型原发灶的SUVmax进行两样本t检验,对2种显像方法诊断效能的比较行x2检验.结果 18F-FLT和18F-FDG PET/CT诊断胃癌原发灶的灵敏度分别为89.2％ (33/37)和91.9％ (34/37),差异无统计学意义(x2=0.158,P＞0.05).弥漫型胃癌的18F-FLTSUVmax为6.89±1.38,与肠型胃癌的3.79±2.45差异有统计学意义(t=4.533,P＜0.05);而两者的18F-FDG SUVmax差异无统计学意义(7.13±1.97与6.36±2.32,t=1.066,P＞0.05).18 F-FLT和18 F-FDGPET/CT对胃癌区域淋巴结转移诊断的灵敏度、特异性、准确性分别为64.8％ (35/54)、97.6％(246/252)、91.8％(281/306)和88.9％ (48/54)、82.9％ (209/252)、84.0％ (257/306),差异均有统计学意义(x2=8.796、30.948、8.854,均P＜0.05);两者联合,灵敏度、特异性、准确性分别提高至92.6％(50/54)、98.8％ (249/252)、97.7％ (299/306).结论 18F-FLT是18F-FDG摄取少或不摄取的弥漫型胃癌的补充显像剂;对于胃癌转移淋巴结,18F-FLT比18F-FDG有更高的特异性和准确性,但灵敏度较低,两者联合可提高诊断准确性.     

18F-FDG PET/CT对原发灶不明的骨转移瘤的诊断价值

目的探讨18F-FDGPET/CT对原发灶不明的骨转移瘤的诊断价值。资料与方法回顾性分析经病理证实的72例原发灶不明的骨转移瘤患者的PET/CT资料,记录原发灶部位、骨转移部位及骨外转移部位(包括前哨淋巴结及脏器)并按CT骨转移诊断标准进行分类,测量其最大标准摄取值。结果 PET/CT显像检查确定61例原发灶,11例未找到原发灶。66例为多发骨转移,6例为单发骨转移;原发灶部位依次为肺癌(31例)、前列腺癌(6例)、胃癌(4例)、结肠癌(3例)、甲状腺癌(3例)等;溶骨性转移以肺癌(22例)、胃肠癌(7例)多见,成骨性骨转移以前列腺癌(5例)、肺癌(4例)多见,混合性骨转移以肺癌(5例)、鼻咽癌(2例)多见;胸部骨及脊柱转移多见肺癌(31例),骨盆及脊柱转移多见肺癌(23例)、前列腺癌(6例)。结论 PET/CT诊断原发灶不明的骨转移瘤时,需根据骨转移的类型、部位及前哨淋巴结和脏器转移的位置找出原发灶,必要时进一步行穿刺活检明确诊断。     

18F-FDG PET/CT在原发灶不明的脑转移瘤中的诊断价值

目的 探讨18F-FDG PET/CT在查找原发灶不明的脑转移瘤中的价值。 方法 回顾性分析17例原发灶不明的脑转移瘤患者的全身18F-FDG PET/CT检查资料。 结果 17例患者均经活检确诊原发灶,准确率100%。原发性肺癌13例,占76%,其中有2例在第二次行PET/CT检查时才检出原发灶;原发性肝癌2例,占12%;原发性贲门癌1例,占6%;原发性升结肠癌1例,占6%。在检查到原发灶的基础上,18F-FDG PET/CT亦发现10例合并转移者,其中合并肺转移者2例、合并淋巴结转移者3例、合并骨转移者2例及合并其他部位转移者3例,共发现病灶61处;2例肝癌患者单发脑转移灶中均有脑卒中。 结论 18F-FDG PET/CT在查找原发灶不明的脑转移瘤原发灶中有重要价值,并为临床分期及治疗提供有利帮助。     

CT未检出原发灶的胸腔积液或肺不张患者18F-FDG显像结果分析

目的评价^18F-脱氧葡萄糖(FDG)符合线路显像(DHTC)寻找CT未能发现原发灶的胸腔积液或肺不张患者的肺癌原发灶，及其对肺癌伴有胸腔积液的患者胸腔积液良恶性鉴别诊断的价值。方法110例CT未发现肺部原发病灶但疑为肺癌及肺癌转移可能的胸腔积液或肺不张患者(其中胸腔积液8．4例，肺不张26例)，进行^18F-FDG DHTC检查。结果38例患者最终确诊为肺癌，其中伴有胸腔积液30例，伴有肺不张8例；另72例为肺部良性病变。^18F-FDG DHTC对CT未能找到原发灶的胸腔积液或肺不张患者肺癌诊断的灵敏度、特异性和准确性分别为97％、78％和85％。30例伴有胸腔积液的肺癌患者中，21例确诊为恶性胸腔积液。^18F-FDG DHTC对良恶性胸腔积液鉴别诊断的灵敏度为86％，特异性为8／9例。结论^18F-FDG DHTC是寻找胸腔积液或肺不张患者肺癌原发灶灵敏可靠的方法，并对良恶性胸腔积液的鉴别诊断有一定的临床价值。     

CT及18F-FDGPET/CT诊断食管癌术前淋巴结转移及N分期对比研究

目的 研究CT及18F-氟脱氧葡萄糖(FDG) PET/CT术前诊断食管癌淋巴结转移及确定N分期的价值.资料与方法 连续随机选择经食管镜或胃镜证实、拟行手术治疗、能够耐受手术的47例食管癌患者,术前1周内行CT及18F-FDG PET/CT检查,以术后病理为“金标准”,比较CT及18F-FDG PET/CT诊断食管癌淋巴结转移及N分期的敏感性、特异性、准确性、阳性预测值及阴性预测值.结果 31例存在淋巴结转移,共切除并分离淋巴结387枚(209组),其中65枚(46组)发现转移.CT诊断淋巴结转移的敏感性、特异性、准确性、阳性预测值、阴性预测值分别为53.8％、92.8％、86.3％、60.3％和90.9％;18F-FDG PET/CT分别为89.2％、93.8％、93.0％、74.4％和97.7％.PET/CT诊断淋巴结转移的敏感性、准确性及阴性预测值均显著高于CT,差异有统计学意义(P＜0.05),特异性及阳性预测值差异无统计学意义(P＞0.05).CT及18F-FDG PET/CT确定淋巴结分期的准确率分别为74.5％和91.5％,差异有统计学意义(P＜0.05).伴淋巴结转移的食管癌原发灶最大标准摄取值(SUVmax)为( 14.899±3.770),而无淋巴结转移者为(9.427±2.854).结论 18F-FDGPET/CT术前诊断食管癌淋巴结转移及确定N分期优于CT;食管癌原发灶SUVmax在一定程度上可以反映淋巴结转移情况.     

超声检查和PET/CT检查诊断甲状腺乳头状癌中央区淋巴结转移的对比研究

目的比较超声检查和18F-FDG PET/CT检查对甲状腺乳头状癌中央区淋巴结转移的诊断价值。方法回顾性分析93例经病理证实的甲状腺乳头状癌患者中央区淋巴结转移情况,与术前超声检查和PET/CT检查对比,评价其诊断甲状腺乳头状癌中央区淋巴结转移的价值。结果超声检查诊断中央区淋巴结转移的敏感度、特异度、准确度、阳性预测值、阴性预测值分别是78.8%、61.0%、71.0%、71.9%、69.4%(χ^2=4.742,P=0.029);PET/CT检查诊断中央区淋巴结转移的敏感度、特异度、准确性、阳性预测值、阴性预测值分别是53.8%、78.0%、64.5%、75.7%、57.1%(χ^2=3.882,P=0.049)。超声检查和PET/CT检查诊断中央区淋巴结转移的ROC曲线下面积(AUC)分别为0.699、0.659。结论超声检查诊断甲状腺乳头状癌中央区淋巴结转移具有较高敏感度和准确性,且因其简便、分辨率高、无辐射等优势,较18F-FDG PET/CT检查更具有显著意义。     

18F-FDG PET/CT显像在胃癌分期及治疗方案制定中的应用价值

目的探讨18F-FDG PET/CT显像在胃癌分期及治疗方案制定中的应用价值。方法回顾性分析46例临床疑诊胃癌患者的18F-FDG PET/CT图像,采用目测法和半定量法对患者PET/CT图像进行分析,即测定SUV_max与最大胃壁厚度（T_max）,以胃镜或手术后取得的病理结果作为“金标准”,评估18F-FDG PET/CT显像对病灶的诊断效能,并采用Pearson相关分析法分析SUV_max与T_max的相关性。结果18F-FDG PET/CT诊断原发病灶的灵敏度、特异度和准确率分别为94.4%、40.0%和82.6%;原发灶SUV_max与T_max呈正相关（r=0.922,P=0.001）;18F-FDG PET/CT诊断淋巴结转移及远处转移的灵敏度、特异度和准确率分别为76.9%、90.0%、82.6%和92.9%、96.9%、95.7%。结论18F-FDG PET/CT在检测胃癌的原发病灶、淋巴结转移灶和远处转移灶时有较高的特异度和灵敏度,在评估临床分期、指导临床制定正确的治疗方案中具有重要的应用价值。     

18F-FDG PET/CT检测淋巴结转移性鳞癌原发灶的价值

目的:探讨 18F-氟脱氧葡萄糖（FDG） PET/CT在淋巴结转移性鳞癌原发灶检测中的临床应用价值。 方法:选取2018年3月至2020年11月于广东省佛山市禅城区中心医院因发现淋巴结转移性鳞癌而原发灶不明行全身 18F-FDG PET/CT检查的56例患者进行回顾性研究,其中男性4...     

Lymph node staging of gastric cancer using (18)F-FDG PET: a comparison study with CT.

This study was performed to compare (18)F-FDG PET with CT for the evaluation of primary tumors and lymph node metastases in gastric cancer. METHODS: Eighty-one patients (28 women and 53 men; mean age, 56.6 y; age range; 32-82 y) who had undergone radical (n = 74) or palliative (n = 7) gastrectomy and lymph node dissection for the management of gastric cancer were included. Preoperative (18)F-FDG PET and CT were reviewed retrospectively for primary tumors of the stomach and lymph node metastases. Any increased (18)F-FDG uptake exceeding that of the adjacent normal gastric wall was considered positive for the primary tumor. Lymph nodes were classified into 3 groups based on their anatomic sites. Because perigastric lymph nodes (N1) were often not clearly differentiated from primary tumors, N1 lymph node metastases were determined when possible. Lymph nodes were considered positive or negative on the basis of the group as a whole. Final conclusions for primary tumors and lymph node metastases were based on histopathologic specimens in all patients. RESULTS: There were 17 patients with early gastric cancer (EGC) and 64 patients with advanced gastric cancer (AGC). For primary tumors, both PET and CT showed a sensitivity of 47% (8/17) for EGC and 98% (63/64) for AGC. The sensitivity of CT for N1 disease was significantly higher than that of PET. (18)F-FDG PET had a sensitivity, specificity, and accuracy of 34% (11/32), 96% (47/49), and 72% (58/81), respectively, for N2 metastases, whereas the corresponding CT values were 44% (14/32), 86% (42/49), and 69% (56/81). For N3 metastases, PET and CT had the same sensitivity, specificity, and accuracy: 50% (3/6), 99% (74/75), and 95% (77/81), respectively. Overall, the sensitivity, specificity, and accuracy of (18)F-FDG PET were not significantly different from those of CT for primary tumors or for N2 and N3 metastases. CONCLUSION: (18)F-FDG PET is as accurate as CT for the detection of primary tumors of either EGC or AGC. The low sensitivities of PET and CT were insufficient to allow decision making on the extent of lymphadenectomy. In contrast, the high specificity of PET for N disease appeared valuable, and the presence of N disease on PET may have a clinically significant impact on the choice of initial therapy.     

18F-FDG PET/CT显像联合HRCT对孤立性原发肺浸润性黏液腺癌的诊断价值

目的探讨孤立性原发肺浸润性黏液腺癌18F-FDG PET/CT显像和HRCT征象及两者联合对该病的诊断价值。方法回顾性分析经病理证实为浸润性黏液腺癌、有18F-FDG PET/CT双时相显像及病灶层面同机HRCT扫描资料的9例患者,对PET/CT早期、延迟显像及滞留指数、HRCT征象进行综合分析。结果HRCT图像上表现为2例呈实性结节、病灶周围无类似卫星灶样影,6例实性结节周围伴小点片及磨玻璃样影,1例为单纯磨玻璃样结节;分叶征(6例)、血管集束征(6例)、支气管充气征(4例)、空泡征(2例)、毛刺征(1例);18F-FDG PET/CT融合图像上8例病灶表现为不均匀FDG代谢增高,早期显像平均SUVmax为3.2±2.5,延迟现象SUVmax增高6例、降低2例,平均SUVmax为3.5±2.4,平均滞留指数为(10.4±29.3)%,9例均未见纵隔、双侧肺门淋巴结及其他部位转移征象,其18F-FDG PET/CT融合图像上18F-FDG摄取与HRCT相匹配,18F-FDG摄取相对集中于结节的实性区域,病灶磨玻璃区18F-FDG摄取不明显;综合手术病理结果等临床资料证实,9例均为T1N0M0期,与PET/CT分期一致。结论对于影像学检查发现肺孤立性占位患者,在单一影像学检查难以明确诊断的情况下,18F-FDG PET/CT双时相显像上病灶不均匀18F-FDG摄取相对集中于其实性区域的代谢方式与HRCT相联合,可辅助孤立性原发性肺浸润性黏液腺癌的诊断。     

Dual-tracer PET/CT imaging in evaluation of metastatic hepatocellular carcinoma.

We have reported previously that (11)C-acetate ((11)C-ACT) PET was complementary to (18)F-FDG PET in the evaluation of primary hepatocellular carcinoma (HCC) in relation to the degree of tumor cellular differentiation. In this retrospective study, our goals were to further explore the complementary role of (11)C-ACT and (18)F-FDG PET in the detection of metastatic HCC disease, to evaluate the tracer characteristics of individual organ metastasis, to identify the risk factors of metastasis, and to evaluate how these results could affect patient management. METHODS: One hundred twenty-one patients were selected for this study. All patients had undergone a "dual-tracer" PET/CT same-day protocol with (11)C-ACT PET/CT followed by (18)F-FDG PET/CT. Sets of criteria were chosen to define "metastasis" and "no metastasis" on a patient basis. The patients considered as true-positive (n = 97) were then divided into 4 groups on the basis of their primary HCC tracer avidity: (18)F-FDG-avid group, (11)C-ACT-avid group, (18)F-FDG- and (11)C-ACT-avid group, and a posttreatment group with metastasis but no baseline dual-tracer PET characterization of the primary tumor and no hepatic recurrence. RESULTS: On a patient basis, dual-tracer PET/CT had a sensitivity of 98%, a specificity of 86%, a positive predictive value of 97%, a negative predictive value of 90%, and an accuracy of 96% in the detection of HCC metastasis. On a lesion basis, 273 metastatic HCC lesions considered as true-positive were detected and categorized according to the organ or site of metastasis: lymph node (abdominal and thoracic, 49%), lung (32%), bone (8%), and others (10%). The lesion-based and patient-based detection sensitivities were 60% and 64%, respectively, by (11)C-ACT and 77% and 79%, respectively, by (18)F-FDG, and they were complementary. In analyzing lesion tracer avidity, there was a positive statistical correlation between primary HCC avidity with the general tendency of metastasis. Clinically significant changes in management were found in patients with true-positive metastasis, of whom 19% were affected by (11)C-ACT PET alone. Dual-tracer PET/CT was more effective than single-tracer PET/CT in identifying candidates for curative therapy (negative predictive value of dual-tracer, (18)F-FDG, and (11)C-ACT PET/CT: 90%, 49%, and 37%, respectively). CONCLUSION: This study confirmed that (18)F-FDG PET/CT is useful in the evaluation of HCC metastasis, although its role in the diagnosis of primary HCC is more limited. Dual-tracer PET/CT had an incremental value and complementary advantage when compared with single-tracer imaging in the evaluation of HCC metastasis.     

肺大细胞神经内分泌癌的18F-FDG PET/CT表现

目的探讨肺大细胞神经内分泌癌（LCNEC）的18F-氟脱氧葡萄糖（FDG）PET/CT的影像学表现。方法回顾性分析2009年10月至2017年5月经病理证实的37例肺LCNEC患者的18F-FDG PET/CT影像学表现,包括病灶位置、形态特征、代谢和淋巴结转移情况,以及最大标准化摄取值（SUV_max）预测淋巴结转移的价值。SUV_max与肿瘤最大径的相关性采用Pearson相关性分析。结果37例肺LCNEC患者均为单发,其中周围型28例（28/37,75.7%）、中央型9例（9/37,24.3%）。30例病灶（30/37,81.1%）可见分叶征,多为浅分叶;10例病灶（10/37,27.0%）可见毛刺征。29例病灶（29/37,78.4%）边界清晰,9例病灶（9/37,24.3%）可见胸膜凹陷征,2例病灶可见液化坏死,1例病灶可见空洞形成,1例病灶内见点状钙化,1例病灶内见充气支气管征。37例病灶18F-FDG代谢程度均高于肝脏,SUV_max为11.7±5.2（3.3~25.3）,肿瘤最大径为（3.2±1.5）cm,SUV_max与肿瘤最大径呈正相关（r=0.569,P=0.000）。15例病灶伴有肺门和（或）纵隔淋巴结转移,8例可见远处转移,包括骨转移4例、肾上腺转移1例、肝脏及骨转移2例、肾上腺及骨转移1例。约登指数最大为0.573,所对应的SUV_max为11.9,诊断效率最高,灵敏度为80.0%,特异度为77.3%。结论肺LCNEC的18F-FDG PET/CT多表现为周围型类圆形软组织结节或肿块,边缘清晰,充气支气管征少见,18F-FDG摄取较高。原发肿瘤SUV_max是判断淋巴结转移的重要半定量指标。