Bullae are is the large blister fluid-filled sacs that form when the fluid is trapped under a thin layer of the skin. They are similar to that of blisters and the vesicles except for the bullae are larger than 1 centimeter in the diameter.
A giant bulla is a complication of emphysema. In areas of lung completely damaged by the disease, air pockets can be develop. These areas threaten by the patient's health not only because of the underlying emphysema. As an the air pocket—a bulla—grows, it takes up to space in the chest cavity and can be encroach on the lungs
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