One hundred and seventy-eight cases (82.4%) were diagnosed by bronchoscopic biopsy, 68 cases (31.5%) were diagnosed by bronchoscopic brushing examination for acid - fast bacillus.

• 216例中经病理学诊断178例(82.；4%25)；毛刷涂片抗酸染色细菌学诊断68例(31