This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular Radiology, Subject name: Radiology
Which of the following chest x-ray finding is a common feature of ARDS and cardiogenic pulmonary edema? 
Select and explain. 
A. Cardiomegaly, B. Pleural effusions, C. Pulmonary vascular redistribution, D. Alveolar and interstitial opacities
D: Alveolar and interstitial opacities
Answer: D: Alveolar and interstitial opacities 
Explanation: In ARDS, the chest radiograph usually reveals alveolar and interstitial opacities involving at least three-quaers of the lung fields. While characteristic for ARDS, these radiographic findings are not specific and can be indistinguishable from cardiogenic pulmonary edema. Unlike the latter, however, the chest x-ray in ARDS rarely shows cardiomegaly, pleural effusions, or pulmonary vascular redistribution. Chest CT in ARDS reveals extensive heterogeneity of lung involvement. Figure: Diffuse bilateral coalescent opacities and groundglas opacities, mediastinal lymphadenomatosis.