RESUMEN
Objective To explore the value of SUV in patients with ascites of unknown cause.Methods A total of 55 patients (24 males,31 females,average age 54.8 years,age range:23-82 years) with ascites of unknown cause who underwent 18F-FDG PET/CT scan were retrospectively enrolled in this study.SUVmax and SUVmean of ascites and liver were measured and their ratios (T/NT) were calculated and compared by two-sample t test.All patients were followed up and had final diagnoses.Sensitivity,specifici ty,accuracy,positive predictive value and negative predictive value were calculated respectively.The diagnostic efficiency was compared among 18F-FDG PET/CT tumor localization alone,ascites radioactivity and ascites cytology examination by x2 test or Fisher exact test.Results Besides the high metabolized primary lesions and/or metastasis,the liver and spleen swamped by ascites with high radioactivity were visualized on MIP images.The SUVmax and SUVmean of malignant ascites were 1.78±0.65 and 1.37±0.38 respectively,which were higher than those of benign ascites (1.11±0.36 and 0.72±0.22; t=4.13,6.82,both P＜0.05).T/NT of malignant ascites was higher than that of benign ascites (SUVmax:0.64±0.20 vs 0.48±0.12,t =3.27,SUVmeax:0.68±0.17 vs 0.38±0.10,t =7.21 ; both P＜0.05).The diagnostic sensitivity,specificity and accuracy of SUV in ascites were 75.0％ (27/36),94.7％ (18/19) and 81.8％ (45/55),respectively.The sensitivity and accuracy of SUV were higher than those of cytological examination (44.4％ (16/36) and 63.6％ (35/55) ; x2 =6.98,4.58,both P＜0.05).The specificity of SUV was higher than that of tumor localization by 18F-FDG PET/CT (63.2％,12/19; x2 =5.70,P＜0.05).Conclusion Significantly higher SUVmax and SUV in malignant ascites than benign ascites were noted,which might play an adjuvant role in patients with ascites of unknown cause.
RESUMEN
Objective:To evaluate the accuracy and ch aracteristics of combined use of 99Tcm-sulfur colloid (SC)and 9 9Tcm-diethyliminodiacetic acid (EHIDA)imaging on the diagnosis of hepat ic adenoma (HA). Methods:8 patients with HA were involved in this study.All of them were studied by nuclear medicine (NM)with dual-radiopharmaceuticals.The 99 Tcm-SC imaging was perfomed first ,then the 99Tcm-EHIDA im aging two days later,and the ratios between lesions and normal liver tissue(L/N) were calculated in terms of different counts within the same size regions of int erest (ROI) in different phases(30min,1h and 2h respectively).Some of the cases were also analysed by CT and/or MRI within one week before the operations. Results:All of the cases were submitted to surgical treatment and c onfirmed diagnosis of HA by pathology. For HA, scintigrahy presented a accuracy of 100%(8/8),which was higher than that of CT and MRI comparatively.For 99 Tcm-EHIDA imaging,there were significant differences in L/N ratios among different phases(30min,1h and 2h). Conclusion:The results show that radionuclide imaging proved to be a safe,invasive and effcetive method on the diagnosis and differential diagnosis of HA,especially ,when CT and/or MRI findings are not typical.