纵隔少见恶性肿瘤的CT及PET/CT诊断

目的 探讨纵膈少见恶性肿瘤的CT及PET/CT表现,提高术前诊断率.方法 回顾性分析经病理证实的纵膈少见恶性肿瘤28例,28例均行CT平扫及增强扫描,其中5例一周内行18-FDG-PET/CT检查.结果 28例中,男24 例,女4例,平均年龄42岁.包括胸腺癌9例,上皮来源性恶性肿瘤9例,生殖源性肿瘤7例,恶性孤立性纤...

CT and PET/CT in the Diagnosis of Rare Malignant Mediastinal Tumor

Objective To investigate CT and PET-CT features of rare malignant mediastinal tumor and improve the preoperative diagnosis rate.Methods 28 cases with rare malignant mediastinal tumor confirmed pathologically were retrospectively analyzed.Plain CT scanning and contrast enhancement were performed to all cases,and 18-FDG-PET/CT was performed to 5 cases within a week among them.Results Among all 28 cases,24 cases were male and 4 cases were female.The average age of patients was 42 years old.All cases were categorized into 6 different tissue sources including thymic carcinoma(n=9),malignant tumors originating from epithelial cells(n=9),tumors originating from germ cells(n=7),malignant solitary fibroma(n=1),malignant pheochromocytoma of Ganglion cells(n=1),sclerosing liposarcoma(n=1).Plain CT scanning showed the single,large and isodense or hypodense mass.The average size was 8.3 cm.Fat density areas were found in 3 cases and stippled calcifications could be seen in 4cases.The masses were round or oval in 3 cases and lobulated in 25 cases.25 cases showed ill-defined edges,and 3 cases showed fairly well-defined edges.All cases showed moderate or obvious enhancement,and 8 cases also showed zones of necrosis which were not enhanced.5 cases showed mediastinal and hilar lymph node metastasis,and 2 cases showed pleural metastasis.Hydrothorax was showed in 8 cases,and thoracic bone metastasis was showed in 1 case.The average SUV value was 12.4(ranges were 4.7-17.8).Conclusion Rare malignant mediastinal tumors have common features with malignant tumors.CT features of rare malignant mediastinal tumors are not specific,but CT examination can show the size,density,edge and invision to surrounding tissues.The SUV value was highly intaked.It helps to improve the diagnostic rate by combining CT with PET/CT.