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* From the Department of Radiology (Drs. Quekel and Goei), Atrium Medical Center, Heerlen, the Netherlands; Department of Epidemiology (Dr. Kessels), Maastricht University and Department of Radiology (Dr. van Engelshoven), University Hospital Maastricht, Maastricht, the Netherlands.
Study objectives: To investigate the miss rate of non-small cell lung cancer (NSCLC) on the chest radiograph. In addition, the characteristics, the delay in diagnosis, and the change in prognosis of the missed lesions were studied.
Design: A retrospective study on patients with histopathologically proven NSCLC during the years 1992 through 1995 in a large community hospital.
Setting: Department of Radiology, Atrium Medical Center, Heerlen, the Netherlands.
Patients: During the study period, 495 patients presented with NSCLC. Of these patients, the complete set of chest radiographs was available for analysis in 396; there were 300 men and 96 women, with a mean age of 68 years.
Main outcome measures: The main outcome measures included the miss rate of NSCLC presenting as nodular lesions. Location, diameter, superposing structures, and delay of missed and detected lesions and the change of prognosis as a consequence of the delay in diagnosis were other measures.
Results: In 49 (19%) of 259 patients with NSCLC presenting as a nodular lesion on the chest radiographs, the lesions were missed. The miss rate was not dependent on location. Superposing structures were more often present in the group of missed lesions than in the group of detected lesions, respectively, 71% and 2%. The median diameter of the missed lesions was 16 mm and of the detected lesions it was 40 mm. The median delay of the missed lesions was 472 days and of the detected lesions it was 29 days. Twenty-two (45%) patients with missed lesions remained in stage T1, 6 (12%) remained in stage T2 and in 21 patients (43%), the tumor stage changed from stage T1 into T2.
Conclusion: The miss rate of 19% in our study is low compared with the rate in the literature but it has a definitive impact on prognosis.
Abbreviation: NSCLC = non-small cell lung cancer
Key Words: diagnostic errors • lung neoplasms • thoracic radiography
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