Acute pulmonary complications in immunocompromised non-AIDS patients: comparison of diagnostic accuracy of CT and chest radiography.

To compare the abilities of computed tomography (CT) and radiography in detection and diagnosis of acute pulmonary complications in immunocompromised non-AIDS patients, the CT scans and radiographs of 45 immunocompromised non-AIDS patients with proven pulmonary disease and 20 normal controls were independently assessed by two observers, without knowledge of clinical or pathologic data. The observers listed the three most likely diagnoses and their degree of confidence in the first-choice diagnosis on a three-point scale. The sensitivity and specificity in detecting pulmonary complications was 100% and 98% for CT, compared to 98% and 93%, respectively, for chest radiography. In the immunocompromised patients, the first-choice diagnosis was correct in 44% of CT and 30% of radiograph readings (P < 0.01). The correct diagnosis was among the top three diagnoses in 70% of CT scans and 53% of radiograph readings (P < 0.01). Confidence level one (definite) was reached in 33% of CT scans and 10% of chest radiographs (P < 0.001). Diseases with a dominant nodular pattern had a higher occurrence of correct first-choice diagnosis (62% vs 34%, P < 0.02) and level one confidence ratings (53% vs 13%, P < 0.001) than diseases with ground-glass opacity, consolidation or irregular linear opacities. We conclude that chest radiographs and CT scans have comparable sensitivity in detecting acute pulmonary complications in immunocompromised non-AIDS patients. CT is superior to chest radiography in the differential diagnosis of acute pulmonary complications in these patients.

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