Pulmonary bulla

A focal lung pneumatosis, is a pocket of air (pneumatosis) in the parenchyma of the lungs, larger than the alveoli. A focal lung pneumatosis can be classified by its wall thickness. Blebs or bullae are also known as focal regions of emphysema. A focal lung pneumatosis, is a pocket of air (pneumatosis) in the parenchyma of the lungs, larger than the alveoli. A focal lung pneumatosis can be classified by its wall thickness. Blebs or bullae are also known as focal regions of emphysema.