Bulla (plural: bullae) can mean:
A cutaneous circumscribed fluid-filled lesion, vesicle or blister greater than more than 10 mm (about 3/8 inch, but some authors say 5mm, others 1 inch !) in diameter. Haemorrhagic bullae tend to be associated with more serious disease.
Flaccid blisters are usually intra-epidermal as the roof of the blister is thin, where as tense blisters are sub-epidermal as the roof of the blister is composed of the whole epidermis and strong enough to remain intact (and not burst). Bullae may be found with a large range of congenital, inflammatory and autoimmune skin disorders where in particular the pathology is either intra-epidermal or sub-epidermal, including:
Middle Ear Bulla
The petrous auditory bulla is a hollow bony structure made up of the mastoid portion and petrous portion of the temporal bone and encloses the inner and middle ears. Evolutionarily primates have auditory bulla formed from the petrosal bone.
Pulmonary bulla are bubble-like expansions of lung tissue classically found in emphysema
- Large pulmonary bulla can restrict lung capacity significantly and giant bulla should be considered for surgical resection.
- There is an association between lung cancer and bullae
- This is a disambiguation page.