[The diagnostic value of CT-guided percutaneous needle lung biopsy in diffuse parenchymal lung diseases].
OBJECTIVE
This study was to evaluate the efficacy and limitation of CT-guided percutaneous cutting needle lung biopsy in the diagnosis of diffuse parenchymal lung diseases (DPLD).


METHODS
A total of 481 patients admitted in Peking Union Medical College Hospital from January 2000 to December 2008 underwent CT-guided percutaneous cutting needle lung biopsy. The patients were evaluated by clinical history, physical examination and lung HRCT. Those with localized opacity or lesions in a single lung in the CT scan were excluded. Finally, 248 patients with DPLD in HRCT were enrolled for this study.


RESULTS
The study patients included 114 males and 134 females, and the mean (± SD) age at diagnosis was 50 ± 16 (range from 13 - 78) years. Confirmed diagnosis by percutaneous needle lung biopsy was obtained in 130 patients (52.4%), including pulmonary infection (35.4%, 46/130), pulmonary malignant diseases (25.4%, 33/130), bronchiolitis obliterans organizing pneumonia/organizing pneumonia (22.3%, 29/130), pulmonary vasculitis (6.2%, 8/130), granulomatous lesions (4.6%, 6/130), pulmonary sarcoidosis (2.3%, 3/130), acute interstitial pneumonia (1.5%, 2/130), pulmonary amyloidosis (1.5%, 2/130), and pulmonary alveolar proteinosis (0.8%, 1/130). Open lung biopsy/video-assisted thoracoscopic surgery was performed in 37 out of 118 cases for which the diagnosis was undetermined by percutaneous lung biopsy. Confirmed diagnosis was obtained in 36 patients, including non-specific interstitial pneumonia (NSIP, 33.3%, 12/36), usual interstitial pneumonia (UIP, 8.3%, 3/36), pulmonary infection (16.7%, 6/36), neoplasm (8.3%, 3/36), lymphoid interstitial pneumonia, pulmonary vasculitis (5.6% 2/36), hypersensitivity pneumonitis (5.6%, 2/36), and pulmonary sarcoidosis, allergic bronchopulmonary aspergillosis, pulmonary hyalinizing granuloma, pneumoconiosis, Castleman's disease, and lymphoproliferative disorder (1 case respectively).


CONCLUSION
CT-guided percutaneous cutting needle lung biopsy can provide confirmed diagnosis in half of patients with DPLD, and has a high diagnostic yield in patients with infectious or neoplastic diseases, but it is not a good method for diagnosis of interstitial lung diseases such as NSIP and UIP.