To evaluate the diagnostic value of ultrathin bronchoscopy and intrabronchial ultrasonography(EBUS-GS)combined with guide sheath in peripheral lung carcinoma.

208 cases of suspected peripheral lung cancer(0.8 cm<diameter<4 cm)were treated with ultrathin bronchoscopy combined with EBUS-GS biopsy from August 2015 to June 2016. The diagnostic rate of benign and malignant lesions were Comparison of different diagnostic factors and the diagnostic efficiency of the evaluation.

One hundred and eighty cases of malignant tumors were diagnosed in 208 cases. The diagnostic rates of EBUS-GS in the pulmonary malignant lesions were higher than that in the benign lesions. There were significant differences(χ²=3.884, P=0.049). The diagnostic rates of the lesions from the hilum distance≤4 cm, ≤5 cm and≤6 cm were 88.158%, 74.545% and 55.102% respectively, there were significant differences(χ²=17.371, P=0.000). The diagnostic rates of bronchial aerated group and non-bronchial aerated group were 84.906%, 70.866% respectively, there were significant differences(χ²=3.93, P=0.047). The sensitivity of ultrathin bronchoscopy combined with EBUS-GS in the diagnosis of peripheral lung carcinoma was 75.000%, specificity was 92.857% and the index was 0.679.

Ultrathin bronchoscopy combined with EBUS-GS is a safe and reliable method for diagnosis of peripheral lung carcinoma.