Diagnostic value and safety of medical thoracoscopy for pleural effusion of different causes

Table 3 Diagnostic yield of medical thoracoscopy

Etiology	Malignant				Tuberculous				Inflammatory
	T	D	UD	MD	T	D	UD	MD	T	D	UD	MD
n	54	41	13	0	43	21	19	3	9	12	0	3
Diagnostic yield, %	75.9				48.8				75.0
Accuracy, %	100				87.5				75.0

D: Diagnosis; MD: Misdiagnosis; T: Total; UD: Undiagnosis. Total is the total diagnosis numbers at discharge; Diagnosis is the diagnosis numbers under medical thoracoscopy (MT); Undiagnosis is the undiagnosed numbers under MT; Misdiagnosis is the diagnosis under MT inconsistent with the diagnosis at discharge or considered diagnosis after effective management. The inflammation diagnostic yield was calculated as the ratio of the final diagnosed number of 9 at discharge and the number of confirmed diagnosis of 12 under MT, and the diagnostic accuracy was obtained by 100% subtracting 25.0% (3/12, misdiagnosis rate).