Pulmonary Alveolar Proteinosis (PAP) is characterized by accumulation of surfactant in alveoli and terminal airways resulting in hypoxemic respiratory failure. A report describes a case of 42 years old male patient with PAP, presented with bilateral chest pain and dyspnea on rest since last four months. General examination, revealed that the patient had hypoxia but he was hemodynamically stable. Chest examination showed bilateral crepitations. Chest radiograph was suggestive of bilateral consolidation and cavitatory changes in right upper and lower zones. HRCT thorax was suggestive of diffuse ground glass opacities with interstitial septal thickening (crazy paving patern). Bronchoalveolar Lavage was PAS positive confirming diagnosis. Whole lung lavage procedure was done for the management of PAP. Patient was asymptomatic after 3 months of the procedure.