Routinely stained cytological preparations of puncture biopsy specimens of mediastinal tumors from 870 patients are examined. Diagnostically informative material is investigated in 759 (87.3%) cases; malignant tumors are diagnosed in 538 (62%) cases, benign in 221 (25.2%). In 59 (6.8%) cases the cytological answers were descriptive, and in 52 (6%) puncture biopsy material was not informative for cytological verification. Diagnostic sensitivity of the cytological method is 94%, diagnostic specificity 71%, and diagnostic efficacy 91%.
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