Pleural fluid protein	3.5 g/dL
Pleural fluid sugar	152 mg/dL
Pleural fluid ADA	7.1 U/L (normal <24)
Pleural fluid LDH	486 U/L
Pleural fluid cytology: Cell count: 212 cells/mm3. DC: lymphocytes 65%, reactive mesothelial cells 32% and neutrophils 3%. Smears studied are highly cellular and show predominantly lymphocytes, few reactive mesothelial cells and occasional neutrophils against haemorrhagic background. Few atypical cells having multinucleation, high N:C ratio, coarse chromatin and prominent nucleoli and irregular nuclear margins are also seen. Impression : IAC system of reporting fluid cytology—category III—atypical (most probably secondary to viral infection).4