الفهرس 
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Abstract
This study was carried out to study the diagnostic yeild of medical thoracoscopy in patients with undiagnosed exudative pleural effusion.
For this purpose, 36 patients (18 males and 18 females with mean age 54.4 ± 16.1 years) with undiagnosed pleural effusion who admitted at chest department of zagazig university hospitals in the period from October 2014 till October 2015 were included.