目的探讨基于增强CT动脉期、静脉期及动静脉期联合的直方图分析在鉴别胃肠道间质瘤和神经鞘瘤的诊断价值。方法回顾性分析行腹部多期增强CT扫描且经手术病理证实的40例胃肠道间质瘤及19例胃肠道神经鞘瘤患者的临床及影像学资料。在uAI R...目的探讨基于增强CT动脉期、静脉期及动静脉期联合的直方图分析在鉴别胃肠道间质瘤和神经鞘瘤的诊断价值。方法回顾性分析行腹部多期增强CT扫描且经手术病理证实的40例胃肠道间质瘤及19例胃肠道神经鞘瘤患者的临床及影像学资料。在uAI Research Portal平台上手动勾画肿瘤感兴趣区并进行直方图分析,获得肿瘤动脉期、静脉期及动静脉期联合直方图特征参数,对各参数进行比较并研究各参数的诊断效能。结果动脉期的直方图特征参数,90%像素值、熵、四分位距、最大值、平均偏差、范围、相对偏差、偏度、均匀性差异具有统计学意义,静脉期的直方图特征参数,熵、四分位距、最大值、平均偏差、相对偏差、均匀性、方差差异具有统计学意义。分别建立动脉期、静脉期及动静脉期联合的鉴别诊断模型,得出动脉期(AUC=0.855)及动静脉期联合(AUC=0.899)诊断效能均高于静脉期模型(AUC=0.751)。结论基于多期增强CT的直方图分析可用于术前鉴别胃肠道间质瘤和神经鞘瘤,动脉期及动静脉期联合的诊断效能更高。展开更多
BACKGROUND Most melanomas identified in the stomach are metastatic;primary gastric melanoma(PGM)is extremely rare,and the relevant studies are relatively scarce.PGM may be incorrectly diagnosed as other gastric malign...BACKGROUND Most melanomas identified in the stomach are metastatic;primary gastric melanoma(PGM)is extremely rare,and the relevant studies are relatively scarce.PGM may be incorrectly diagnosed as other gastric malignant tumor types.CASE SUMMARY We describe a rare case of PGM confirmed through long-term clinical observation and pathological diagnosis.A 67-year-old woman presented to our hospital with recurrent chest tightness and chest pain.Digital gastrointestinal radiography revealed a circular shadow in the gastric cardia.Computed tomography(CT)revealed a heterogeneous tumor with uneven enhancement.Enlarged lymph nodes were noted in the lesser curvature of the stomach.On magnetic resonance imaging(MRI),T1-and T2-weighted imaging revealed hyperintensity in and hypointensity in the tumor,respectively,both of which increased substantially after uneven enhancement.Near total gastrectomy was performed,and the tumor was pathologically confirmed to be a gastric melanoma.Because no other possible primary site of malignant melanoma was suspected,a clinical diagnosis of PGM was made.The patient was followed for nearly 5 years,during which she received CT reexamination,but no recurrence or metastasis was observed.CONCLUSION Certain imaging characteristics could be revealed in PGM.Imaging examination can be of great value in preoperative diagnosis,differential diagnosis,and followup of patients with PGM.展开更多
文摘目的探讨基于增强CT动脉期、静脉期及动静脉期联合的直方图分析在鉴别胃肠道间质瘤和神经鞘瘤的诊断价值。方法回顾性分析行腹部多期增强CT扫描且经手术病理证实的40例胃肠道间质瘤及19例胃肠道神经鞘瘤患者的临床及影像学资料。在uAI Research Portal平台上手动勾画肿瘤感兴趣区并进行直方图分析,获得肿瘤动脉期、静脉期及动静脉期联合直方图特征参数,对各参数进行比较并研究各参数的诊断效能。结果动脉期的直方图特征参数,90%像素值、熵、四分位距、最大值、平均偏差、范围、相对偏差、偏度、均匀性差异具有统计学意义,静脉期的直方图特征参数,熵、四分位距、最大值、平均偏差、相对偏差、均匀性、方差差异具有统计学意义。分别建立动脉期、静脉期及动静脉期联合的鉴别诊断模型,得出动脉期(AUC=0.855)及动静脉期联合(AUC=0.899)诊断效能均高于静脉期模型(AUC=0.751)。结论基于多期增强CT的直方图分析可用于术前鉴别胃肠道间质瘤和神经鞘瘤,动脉期及动静脉期联合的诊断效能更高。
基金Supported by the Medical Health Science and Technology Project of Zhejiang Province(2019RC028)
文摘BACKGROUND Most melanomas identified in the stomach are metastatic;primary gastric melanoma(PGM)is extremely rare,and the relevant studies are relatively scarce.PGM may be incorrectly diagnosed as other gastric malignant tumor types.CASE SUMMARY We describe a rare case of PGM confirmed through long-term clinical observation and pathological diagnosis.A 67-year-old woman presented to our hospital with recurrent chest tightness and chest pain.Digital gastrointestinal radiography revealed a circular shadow in the gastric cardia.Computed tomography(CT)revealed a heterogeneous tumor with uneven enhancement.Enlarged lymph nodes were noted in the lesser curvature of the stomach.On magnetic resonance imaging(MRI),T1-and T2-weighted imaging revealed hyperintensity in and hypointensity in the tumor,respectively,both of which increased substantially after uneven enhancement.Near total gastrectomy was performed,and the tumor was pathologically confirmed to be a gastric melanoma.Because no other possible primary site of malignant melanoma was suspected,a clinical diagnosis of PGM was made.The patient was followed for nearly 5 years,during which she received CT reexamination,but no recurrence or metastasis was observed.CONCLUSION Certain imaging characteristics could be revealed in PGM.Imaging examination can be of great value in preoperative diagnosis,differential diagnosis,and followup of patients with PGM.
