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1 The Department of Diagnostic Roentgenology, Montefiore Hospital, New York 67, New York.
1. The experience at one institution with the radiological and laboratory examinations performed in conjunction with evaluation of 78 obscure peripheral pulmonary lesions, all of whom eventually came to surgery, is presented.
2. The examinations included radiography, both thoracic and extrathoracic (the latter principally a search for a primary tumor) sputum for acid-fast organisms, bronchoscopy, and cytological studies.
3. The elapsed hospital time in accomplishing these investigations averaged about two weeks.
4. Histology of surgical specimens revealed bronchogenic carcinoma in 55 of the 78 cases.
5. The endeavor of establishing a lung lesion as metastatic or of tuberculous origin was particularly unrewarding.
6. The low percentage of positive returns in the diagnostic procedures described appears outweighed by the disadvantages of delaying definitive therapy and prolongation of hospitalization.
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