The positive rate of malignant lesions in group A ( 71.1 % , 32/45 ) was significantly lower than that in group B ( 95.4 % , 42/44 ) ( = 7.75 , P < 0.05 ) ; the accurate rate of biopsy in group A ( 77.6 % , 45/58 ) was significantly lower than that in group B ( 96.4 % , 53/55 , = 7.09 , P < 0.05 ) .