Table 1. Aetiology of the pleural effusion.

Aetiology PE	All Patients N (%)
Benign PE	198 (64.5)
Tuberculous PE	21 (10.6)
Parapneumonic PE	83 (41.9)
Non-infective PE	94 (47.5)
Malignant PE	109 (35.5)
Lung cancer	59 (54.1)
Mesothelioma	8 (7.3)
Ovarian cancer	11 (10.1)
Gastric cancer	5 (4.6)
Breast cancer	14 (12.8)
Haematological cancers	8 (7.3)
Others*	4 (3.7)

PE = pleural effusion

* 1 melanoma (centre 1), 1 bladder cancer (centre 1), 1 hepatocellular carcinoma (centre 2), and 1 metastatic cancer of unknown origin (centre 1).