Abstract
Pleural effusion is common in cancer patients and to determine its malignant origin is of huge clinical significance. PET/CT with ¹⁸F-FDG is of diagnostic value in staging and follow-up, but its ability to differentiate between malignant and benign effusions is not precisely known. We examined 50 PET/CT from 47 patients (29 men, 18 women, 60 ± 16 years) with pleural effusion and known cancer (24 NSCLC, 7 lymphomas, 5 breasts, 4 GIST, 3 mesotheliomas, 2 head and neck, 2 malignant teratoma, 1 colorectal, 1 oesophageal, 1 melanoma) for FDG uptake in the effusions using SUV(max). This was correlated to cytopathology performed after a median of 21 days (interquartile range -3 to 23), which included pH, relative distribution (macrophages, neutrophils, eosinophils, basophils, lymphocytes, plasmocytes), and absolute cell count. Malignant cells were found in 17 effusions (34%) (6 NSCLC, 5 lymphomas, 2 breasts, 2 mesotheliomas, 2 malignant teratomas). SUV in malignant effusions were higher than in benign ones [3.7 (95%CI 1.8-5.6) vs. 1.7 g/ml (1.5-1.9), p = 0.001], with a correlation between malignant effusion and SUV (Spearman coefficient r = 0.50, p = 0.001), but not with other cytopathological or radiological parameters (ROC area 0.83...Continue Reading
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