Pneumonia Eosinophilic Anatomy
To better understand eosinophilic pneumonia, it helps to understand the anatomy of the lungs.
Inside the chest, the windpipe, or trachea, divides into two smaller tubes: the right bronchus and the left bronchus. The right bronchus enters the right lung and the left bronchus enters the left lung. The right bronchus and left bronchus branch into smaller and smaller tubes.
The smallest tubes, called bronchioles, end in tiny air sacs, called alveoli. Blood flows very close to the walls of the alveoli. Oxygen and carbon dioxide pass between the air and the bloodstream through the wall of the alveoli.
- Minakuchi M, Niimi A, Matsumoto H, Amitani R, Mishima M. Chronic eosinophilic pneumonia: treatment with inhaled corticosteroids. Respiration. 2003 Jul-Aug;70(4):362-6. 
- Mochimaru H, Kawamoto M, Fukuda Y, Kudoh S. Clinicopathological differences between acute and chronic eosinophilic pneumonia. Respirology. 2005 Jan;10(1):76-85. 
- Shorr AF, Scoville SL, Cersovsky SB, Shanks GD, Ockenhouse CF, Smoak BL, Carr WW, Petruccelli BP. Acute eosinophilic pneumonia among US Military personnel deployed in or near Iraq. JAMA. 2004 Dec 22;292(24):2997-3005.