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A 20-year-old male patient who worked as a salesman was referred to the Department of Chest Diseases due to opacities seen in the upper zones of both lungs on the posteroanterior chest radiography taken for screening in the tuberculosis control dispensary. The patient had no complaint, and the physical examination revealed no pathological finding. His arterial blood pressure was 110/70 mmHg, pulse was 88/min, temperature was 36.7°C, and SpO2 was 97% (oxygen-free). The results of laboratory analyses were found to be as follows: white blood cell count, 8.07×103/μL; eosinophils, 3.46%; hemoglobin, 16.6 g/dL; hematocrit, 47.8%; platelet count, 274,000/μL; complete urine test, normal; sedimentation, 2 mm/hour; C-reactive protein, 1.06 mg/dL; aspartate aminotransferase, 51 U/L; alanine aminotransferase, 78 U/L; and urea, 25 mg/dL. In arterial blood gas, the value of PO2 was 93.7 mmHg, PCO2 was 33.7 mmHg, HCO3 was 21.1 mmoL/L, SaO2 was 97.9%, and pH was 7.38. The patient’s posteroanterior chest radiography revealed diffuse patchy opacities in the upper and middle zones of both lungs (Figure 1). The patient had three negative sputum smear reports for acid-fast bacillus (AFB). There was a restrictive type disorder on the spirometry of the patient, and carbon monoxide diffusing capacity (DLCO) and DLCO/VA was measured as 64% and 98% respectively. High-resolution computed tomography (HRCT) of the chest revealed patchy ground-glass areas with peripheral localization,

Bilateral Upper Zone Patchy Opacities on the Chest Radiography Taken for Screening in a Patient without Any Smptoms: What Is Your Diagnosis?