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During a 3.5-year period (January 1, 1987, to June 30, 1990) 420 percutaneous fine needle aspiration (FNA) biopsies were performed on 390 patients (309 males, 81 females) suffering from one or more intrathoracic, radiologically visible lesions. Aspirations were carried out using 21- or 23-gauge Chiba needles under fluoroscopic or computed tomographic control. The aspirates were used to make minibiopsies and cytologic smears. Diagnosis was possible in 373 cases (95.64%): on the first pass in 344 cases, on the second in 28 cases and on the third in 1. In 17 cases (4.36%) the aspirate was inadequate for diagnosis. There were complications in 10 cases (2.56%) (9 pneumothorax and 1 hemophtysis) requiring intensive care. The 373 percutaneous FNA biopsy diagnoses included 256 malignant tumors (68.63%), of which 234 were primary and 22 were secondary, and 117 benign lesions (31.37%), 5 of them neoplastic and 112 nonneoplastic. Three hundred two of 373 percutaneous FNA biopsy diagnoses were followed (80.96%). One hundred twenty-three follow-ups were histologic (40.73%), including secondary tumors, which could be compared with the primary histotype. Twenty-eight follow-ups were cytologic (9.27%), and 151 were clinical (50.00%), using progression of the disease or the beginning of chemoradiotherapy as a criterion for malignancy and a stable condition or regression of the lesion with nononcologic medical treatment as a criterion for benignity. Percutaneous FNA biopsy diagnoses were confirmed in 288 cases (221 true positives and 67 true negatives) and unconfirmed in 14 (1 false positive and 13 false negatives). Specificity, sensitivity, negative predictive value, positive predictive value and total diagnostic accuracy were, respectively, 98.52, 94.44, 83.75, 99.54 and 95.36%. The histologic typing accuracy of percutaneous FNA biopsy on 70 specimens of surgically removed malignant epithelial neoplasias was 70.00%. These results confirm that percutaneous FNA biopsy is a reliable method of diagnosing intrathoracic masses and reduces the need for diagnostic thoracotomy.
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