Sandstorm appearance on Chest radiograph is characteristic of?: (A) Pulmonary edema, (B) Pulmonary alveolar proteinosis, (C) Pulmonary alveolar microlithiasis, (D) Pulmonary thromboembolism
Answer is C. Pulmonary alveolar microlithiasis is a chronic disease characterized by widespread diffuse bilateral intraalveolar accumulation of minute calculi (microlithiasis) especially in mid and lower zones, giving characteristic sandstrom appearance on chest radiographs.