Medicine Periodic Acid Schiff (PAS) stain positive intra-alveolar material is seen in? A Alpha 1 antitrypsin deficiency B Pulmonary Alveolar Proteinosis C Abetalipoproteinemia D Lipoid pneumonia 💡 Explanation Periodic Acid Schiff (PAS) stain positive intra-alveolar material is seen in? ✓ Correct Answer: B. Pulmonary Alveolar Proteinosis